diff --git a/index.template.html b/index.template.html
index a3c1f9aab..0275e41a7 100644
--- a/index.template.html
+++ b/index.template.html
@@ -103,6 +103,7 @@
 		<script src="//play.pokemonshowdown.com/js/lib/html-sanitizer-minified.js?"></script>
 		<script src="//play.pokemonshowdown.com/js/lib/lodash.compat.js?"></script>
 		<script src="//play.pokemonshowdown.com/js/lib/backbone.js?"></script>
+		<script src="//play.pokemonshowdown.com/js/lib/d3.v3.min.js"></script>
 
 		<script>
 			document.getElementById('loading-message').innerHTML += ' DONE<br />Loading data...';
@@ -124,6 +125,7 @@
 		<script src="//play.pokemonshowdown.com/js/client-teambuilder.js?"></script>
 		<script src="//play.pokemonshowdown.com/js/client-ladder.js?"></script>
 		<script src="//play.pokemonshowdown.com/js/client-chat.js?"></script>
+		<script src="//play.pokemonshowdown.com/js/client-chat-tournament.js"></script>
 		<script src="//play.pokemonshowdown.com/js/client-battle.js?"></script>
 		<script src="//play.pokemonshowdown.com/js/client-rooms.js?"></script>
 		<script src="//play.pokemonshowdown.com/js/storage.js?"></script>
diff --git a/js/client-chat-tournament.js b/js/client-chat-tournament.js
new file mode 100644
index 000000000..32c9d08cd
--- /dev/null
+++ b/js/client-chat-tournament.js
@@ -0,0 +1,574 @@
+(function($) {
+
+	function arrayToPhrase(array, finalSeparator) {
+		if (array.length <= 1)
+			return array.join();
+		finalSeparator = finalSeparator || "and";
+		return array.slice(0, -1).join(", ") + " " + finalSeparator + " " + array.slice(-1)[0];
+	}
+
+	function clampPosition(element, position) {
+		var $element = $(element);
+
+		var elementWidth = $element.width();
+		var parentWidth = $element.parent().width();
+		if (parentWidth >= elementWidth)
+			position.left = parentWidth / 2 - elementWidth / 2;
+		else if (position.left < parentWidth - elementWidth)
+			position.left = parentWidth - elementWidth;
+		else if (position.left > 0)
+			position.left = 0;
+
+		var elementHeight = $element.height();
+		var parentHeight = $element.parent().height();
+		if (parentHeight >= elementHeight)
+			position.top = parentHeight / 2 - elementHeight / 2;
+		else if (position.top < parentHeight - elementHeight)
+			position.top = parentHeight - elementHeight;
+		else if (position.top > 0)
+			position.top = 0;
+	}
+
+	function makeDraggable(element, position) {
+		var $element = $(element);
+		position = position || {};
+
+		$element.css({
+			'user-select': 'none',
+			cursor: 'default',
+			position: 'absolute'
+		});
+
+		if (!('left' in position) || position.isDefault) {
+			position.left = $element.parent().width() / 2 - $element.width() / 2;
+			position.top = 0;
+			position.isDefault = true;
+		}
+
+		clampPosition(element, position);
+		$element.css({
+			left: position.left,
+			top: position.top
+		});
+
+		var isMouseDown = false;
+		var innerX = 0;
+		var innerY = 0;
+
+		$element.on('mousedown', function (e) {
+			innerX = e.pageX - this.offsetLeft;
+			innerY = e.pageY - this.offsetTop;
+			isMouseDown = true;
+		});
+
+		$(document).on('mousemove', function (e) {
+			if (isMouseDown) {
+				position.left = e.pageX - innerX;
+				position.top = e.pageY - innerY;
+				delete position.isDefault;
+				clampPosition(element, position);
+				$element.css({
+					left: position.left,
+					top: position.top
+				});
+			}
+		}).on('mouseup', function () {
+			isMouseDown = false;
+		});
+	}
+
+	var TournamentBox = this.TournamentBox = (function () {
+		function TournamentBox(room, $wrapper) {
+			this.room = room;
+			this.$wrapper = $wrapper;
+
+			$wrapper.html(
+				'<div class="tournament-title"><span class="tournament-format"></span> <span class="tournament-generator"></span> Tournament</div>' +
+				'<div class="tournament-box">' +
+					'<div class="tournament-bracket"></div>' +
+					'<div class="tournament-tools">' +
+						'<button class="button tournament-join">Join</button><button class="button tournament-leave">Leave</button>' +
+						'<div class="tournament-nomatches">There are currently no new matches available for you. Please wait for some other battles to end.</div>' +
+						'<div class="tournament-challenge">' +
+							'<span class="tournament-challenge-user"></span>' +
+							'<span class="tournament-challenge-team"></span>' +
+							'<button class="button tournament-challenge-challenge">Challenge</button>' +
+						'</div>' +
+						'<div class="tournament-challengeby"></div>' +
+						'<div class="tournament-challenging"></div>' +
+						'<div class="tournament-challenged">' +
+							'<div class="tournament-challenged-message"></div>' +
+							'<span class="tournament-challenge-team"></span>' +
+							'<button class="button tournament-challenge-accept">Accept</button>' +
+						'</div>' +
+					'</div>' +
+				'</div>');
+
+			this.$title = $wrapper.find('.tournament-title');
+			this.$format = $wrapper.find('.tournament-format');
+			this.$generator = $wrapper.find('.tournament-generator');
+			this.$box = $wrapper.find('.tournament-box');
+			this.$bracket = $wrapper.find('.tournament-bracket');
+			this.$tools = $wrapper.find('.tournament-tools');
+			this.$join = $wrapper.find('.tournament-join');
+			this.$leave = $wrapper.find('.tournament-leave');
+			this.$noMatches = $wrapper.find('.tournament-nomatches');
+			this.$challenge = $wrapper.find('.tournament-challenge');
+			this.$challengeUser = $wrapper.find('.tournament-challenge-user');
+			this.$challengeTeam = $wrapper.find('.tournament-challenge-team');
+			this.$challengeChallenge = $wrapper.find('.tournament-challenge-challenge');
+			this.$challengeBy = $wrapper.find('.tournament-challengeby');
+			this.$challenging = $wrapper.find('.tournament-challenging');
+			this.$challenged = $wrapper.find('.tournament-challenged');
+			this.$challengedMessage = $wrapper.find('.tournament-challenged-message');
+			this.$challengeAccept = $wrapper.find('.tournament-challenge-accept');
+
+			this.isActive = false;
+			this.info = null;
+			this.isJoined = false;
+			this.bracketData = null;
+			this.savedBracketPosition = {};
+			this.challenges = null;
+			this.challengeBys = null;
+
+			var self = this;
+			this.$title.on('click', function() {
+				self.toggleBoxVisibility();
+			});
+			this.$box.on('transitionend webkitTransitionEnd oTransitionEnd otransitionend', function() {
+				if (self.$box.hasClass('active'))
+					self.$box.css('transition', 'none');
+				if (!self.isActive)
+					self.$wrapper.removeClass('active');
+			});
+
+			this.$join.on('click', function() {
+				self.room.send('/tournament join');
+			});
+			this.$leave.on('click', function() {
+				self.room.send('/tournament leave');
+			});
+			this.$challengeChallenge.on('click', function() {
+				var team = Storage.teams[self.$challengeTeam.children().val()];
+				self.room.send('/utm ' + JSON.stringify(team ? team.team : null));
+				self.room.send('/tournament challenge ' + self.$challengeUser.children().val());
+			});
+			this.$challengeAccept.on('click', function() {
+				var team = Storage.teams[self.$challengeTeam.children().val()];
+				self.room.send('/utm ' + JSON.stringify(team ? team.team : null));
+				self.room.send('/tournament acceptchallenge');
+			});
+		}
+
+		TournamentBox.prototype.updateLayout = function () {
+			this.$box.css('max-height', this.$box.hasClass('active') ? this.$box[0].scrollHeight: '');
+			if (this.$bracket.hasClass('tournament-bracket-overflowing')) {
+				clampPosition(this.$bracket.children(), this.savedBracketPosition);
+				this.$bracket.children().css({
+					left: this.savedBracketPosition.left,
+					top: this.savedBracketPosition.top
+				});
+			} else {
+				if (this.$bracket[0].offsetHeight < this.$bracket[0].scrollHeight ||
+					this.$bracket[0].offsetWidth < this.$bracket[0].scrollWidth) {
+					this.$bracket.addClass('tournament-bracket-overflowing');
+					makeDraggable(this.$bracket.children().first(), this.savedBracketPosition);
+				}
+			}
+		};
+		TournamentBox.prototype.setBoxVisibility = function (isVisible) {
+			if (isVisible) {
+				if (this.$box.hasClass('active'))
+					return;
+				this.$box.addClass('active');
+			} else {
+				if (!this.$box.hasClass('active'))
+					return;
+				this.$box.removeClass('active');
+			}
+			this.$box.css('transition', '');
+			this.$box.css('max-height', this.$box.hasClass('active') ? this.$box[0].scrollHeight: '');
+		};
+		TournamentBox.prototype.toggleBoxVisibility = function () {
+			this.setBoxVisibility(!this.$box.hasClass('active'));
+		};
+
+		TournamentBox.prototype.parseMessage = function (data, isBroadcast) {
+			if (Config.server.id !== "battletower") return true;
+			if (isBroadcast) {
+				// TODO
+				return true;
+			} else {
+				var cmd = data.shift().toLowerCase();
+
+				if (!this.isActive && cmd !== 'end') {
+					this.$wrapper.addClass("active");
+					this.$box.addClass("active");
+					this.isActive = true;
+				}
+
+				switch (cmd) {
+					case 'create':
+						var format = BattleFormats[data[0]].name;
+						var type = data[1];
+						this.room.$chat.append("<div class=\"notice tournament-message-create\">A " + format + " " + Tools.escapeHTML(type) + " Tournament has been created.</div>");
+						this.room.notifyOnce("Tournament created", "Room: " + this.room.title + "\nFormat: " + format + "\nType: " + type, 'tournament-create');
+						break;
+
+					case 'join':
+						this.room.$chat.append("<div class=\"notice tournament-message-join\">" + Tools.escapeHTML(data[0]) + " has joined the tournament</div>");
+						break;
+
+					case 'leave':
+						this.room.$chat.append("<div class=\"notice tournament-message-leave\">" + Tools.escapeHTML(data[0]) + " has left the tournament</div>");
+						break;
+
+					case 'start':
+						this.room.$chat.append("<div class=\"notice tournament-message-start\">The tournament has started!</div>");
+						break;
+
+					case 'disqualify':
+						this.room.$chat.append("<div class=\"notice tournament-message-disqualify\">" + Tools.escapeHTML(data[0]) + " has been disqualified from the tournament</div>");
+						break;
+
+					case 'update':
+						this.$bracket.removeClass('tournament-bracket-overflowing');
+						this.$tools.find('.active').andSelf().removeClass('active');
+						if (this.info && this.info.isStarted)
+							this.$noMatches.addClass('active');
+						this.isJoined = false;
+						this.challenges = null;
+						this.challengeBys = null;
+						break;
+
+					case 'info':
+						this.info = JSON.parse(data.join('|'));
+						this.$format.text(BattleFormats[this.info.format].name);
+						this.$generator.text(this.info.generator);
+						break;
+
+					case 'isjoined':
+						this.isJoined = true;
+						break;
+
+					case 'bracketdata':
+						// The 'isjoined' packet isn't a guaranteed packet to all users, so that packet's
+						// handling is placed in the immediate next guaranteed packet, here
+						if (!this.info.isStarted)
+							if (this.isJoined)
+								this.$leave.addClass('active');
+							else
+								this.$join.addClass('active');
+						if (!this.info.isStarted || this.isJoined)
+							this.$tools.addClass('active');
+
+						this.bracketData = JSON.parse(data.join('|'));
+						this.$bracket.empty()
+						var $bracket = this.generateBracket(this.bracketData);
+						if ($bracket) {
+							this.$bracket.append($bracket);
+							this.updateLayout();
+						}
+						break;
+
+					case 'challenges':
+						this.$noMatches.removeClass('active');
+						this.challenges = data[0].split(',');
+						this.$challengeUser.html(this.renderChallengeUsers());
+						this.$challengeTeam.html(app.rooms[''].renderTeams(this.info.format));
+						this.$challengeTeam.children().data('type', 'challengeTeam');
+						this.$challengeTeam.children().attr('name', 'tournamentButton');
+						this.$challenge.addClass("active");
+
+						this.setBoxVisibility(true);
+						this.room.notifyOnce("Tournament challenges available", "Room: " + this.room.title, 'tournament-challenges');
+						break;
+
+					case 'challengebys':
+						this.$noMatches.removeClass('active');
+						this.challengeBys = data[0].split(',');
+						this.$challengeBy.text((this.challenges ? "Or" : "Please") + " wait for " + arrayToPhrase(this.challengeBys, "or") + " to challenge you.");
+						this.$challengeBy.addClass("active");
+						break;
+
+					case 'challenging':
+						this.$noMatches.removeClass('active');
+						this.$challenging.text("Challenging " + data[0] + "...").addClass("active");
+						break;
+
+					case 'challenged':
+						this.$noMatches.removeClass('active');
+						this.$challengedMessage.text(data[0] + " has challenged you.");
+						this.$challengeTeam.html(app.rooms[''].renderTeams(this.info.format));
+						this.$challengeTeam.children().data('type', 'challengeTeam');
+						this.$challengeTeam.children().attr('name', 'tournamentButton');
+						this.$challenged.addClass("active");
+
+						this.setBoxVisibility(true);
+						this.room.notifyOnce("Tournament challenge from " + data[0], "Room: " + this.room.title, 'tournament-challenged');
+						break;
+
+					case 'battlestart':
+						this.room.$chat.append('<div class="notice tournament-message-battlestart"><a href="' + app.root + toRoomid(data[2]).toLowerCase() + '" class="ilink">' +
+							"A tournament battle between " + Tools.escapeHTML(data[0]) + " and " + Tools.escapeHTML(data[1]) + " has started." +
+							'</a></div>');
+						break;
+
+					case 'battleend':
+						var result = "drawn";
+						if (data[2] === 'win')
+							result = "won";
+						else if (data[2] === 'loss')
+							result = "lost";
+						this.room.$chat.append('<div class="notice tournament-message-battleend">' +
+							Tools.escapeHTML(data[0]) + " has " + result + " the match " + Tools.escapeHTML(data[3].split(',').join(' - ')) + " against " + Tools.escapeHTML(data[1]) +
+							(data[4] ? " but the tournament does not support drawing, so it did not count" : "") +
+							'</div>');
+						break;
+
+					case 'end':
+						var endData = JSON.parse(data[0]);
+
+						var $bracket = this.generateBracket(endData.bracketData);
+						if ($bracket) {
+							var $bracketMessage = $('<div class="notice tournament-message-end-bracket"></div>').append($bracket);
+							this.room.$chat.append($bracketMessage);
+							if ($bracketMessage[0].offsetHeight < $bracketMessage[0].scrollHeight ||
+								$bracketMessage[0].offsetWidth < $bracketMessage[0].scrollWidth) {
+								$bracketMessage.addClass('tournament-message-end-bracket-overflowing');
+								makeDraggable($bracket);
+							}
+						}
+
+						this.room.$chat.append("<div class=\"notice tournament-message-end-winner\">Congratulations to " + Tools.escapeHTML(arrayToPhrase(endData.results[0])) + " for winning the tournament!</div>");
+						if (endData.results[1])
+							this.room.$chat.append("<div class=\"notice tournament-message-end-runnerup\">Runner-up" + (endData.results[1].length > 1 ? "s" : "") +": " + Tools.escapeHTML(arrayToPhrase(endData.results[1])) + "</div>");
+
+						// Fallthrough
+
+					case 'forceend':
+						this.isActive = false;
+						this.info = null;
+						this.bracketData = null;
+						this.savedBracketPosition = {};
+
+						this.$box.removeClass("active");
+						this.$box.css('transition', '');
+
+						if (cmd === 'forceend')
+							this.room.$chat.append("<div class=\"notice tournament-message-forceend\">The tournament was forcibly ended.</div>");
+						break;
+
+					default:
+						return true;
+				}
+
+				this.$box.css('max-height', this.$box.hasClass('active') ? this.$box[0].scrollHeight : '');
+			}
+		};
+
+		TournamentBox.prototype.generateBracket = function (data) {
+			if (data.type === 'tree') {
+				if (!data.rootNode)
+					return;
+
+				var nodeSize = {
+					width: 150, height: 20,
+					radius: 5,
+					separationX: 30, separationY: 15
+				};
+
+				var $div = $('<div class="tournament-bracket-tree"></div>');
+
+				var nodesByDepth = [];
+				var stack = [{node: data.rootNode, depth: 0}];
+				while (stack.length > 0) {
+					var frame = stack.pop();
+
+					if (!nodesByDepth[frame.depth])
+						nodesByDepth.push(0);
+					++nodesByDepth[frame.depth];
+
+					frame.node.children.forEach(function (child) {
+						stack.push({node: child, depth: frame.depth + 1});
+					});
+				}
+				var maxDepth = nodesByDepth.length;
+				var maxWidth = 0;
+				nodesByDepth.forEach(function (nodes) {
+					if (nodes > maxWidth)
+						maxWidth = nodes;
+				});
+
+				nodeSize.realWidth = nodeSize.width + nodeSize.radius * 2;
+				nodeSize.realHeight = nodeSize.height + nodeSize.radius * 2;
+				nodeSize.smallRealHeight = nodeSize.height / 2 + nodeSize.radius * 2;
+				var size = {
+					width: nodeSize.realWidth * maxDepth + nodeSize.separationX * maxDepth,
+					height: nodeSize.realHeight * (maxWidth + 0.5) + nodeSize.separationY * maxWidth
+				};
+
+				var tree = d3.layout.tree()
+					.size([size.height, size.width - nodeSize.realWidth - nodeSize.separationX])
+					.separation(function () { return 1; })
+					.children(function (node) {
+						return node.children.length === 0 ? null : node.children;
+					});
+				var nodes = tree.nodes(data.rootNode);
+				var links = tree.links(nodes);
+
+				var layoutRoot = d3.select($div[0])
+					.append('svg:svg').attr('width', size.width).attr('height', size.height)
+					.append('svg:g')
+					.attr('transform', 'translate(' + (-(nodeSize.realWidth + nodeSize.separationX) / 2) + ',0)');
+
+				var link = d3.svg.diagonal()
+					.source(function (link) {
+						return {x: link.source.x, y: link.source.y + nodeSize.realWidth / 2};
+					})
+					.target(function (link) {
+						return {x: link.target.x, y: link.target.y - nodeSize.realWidth / 2};
+					})
+					.projection(function (link) {
+						return [size.width - link.y, link.x];
+					});
+				layoutRoot.selectAll('path.tournament-bracket-tree-link').data(links).enter()
+					.append('svg:path')
+					.attr('d', link)
+					.classed('tournament-bracket-tree-link', true)
+					.classed('tournament-bracket-tree-link-active', function (link) {
+						return link.source.state === 'finished' && link.source.team === link.target.team;
+					});
+
+				var nodeGroup = layoutRoot.selectAll('g.tournament-bracket-tree-node').data(nodes).enter()
+					.append('svg:g').classed('tournament-bracket-tree-node', true).attr('transform', function (node) {
+						return 'translate(' + (size.width - node.y) + ',' + node.x + ')';
+					});
+				nodeGroup.append('svg:rect')
+					.attr('rx', nodeSize.radius)
+					.attr('x', -nodeSize.realWidth / 2).attr('width', nodeSize.realWidth)
+					.each(function (node) {
+						var elem = d3.select(this);
+						if (node.children.length === 0)
+							elem.attr('y', -nodeSize.smallRealHeight / 2).attr('height', nodeSize.smallRealHeight);
+						else
+							elem.attr('y', -nodeSize.realHeight / 2).attr('height', nodeSize.realHeight);
+					});
+				nodeGroup.each(function (node) {
+					var elem = d3.select(this);
+					if (node.children.length === 0) {
+						elem.classed('tournament-bracket-tree-node-team', true);
+						elem.append('svg:text').text(node.team || "Unavailable");
+					} else {
+						elem.classed('tournament-bracket-tree-node-match', true);
+						elem.classed('tournament-bracket-tree-node-match-' + node.state, true);
+						if (node.state === 'unavailable')
+							elem.append('svg:text').text("Unavailable");
+						else {
+							var teams = elem.append('svg:text').attr('y', -nodeSize.realHeight / 5).classed('tournament-bracket-tree-node-match-teams', true);
+							var teamA = teams.append('svg:tspan').classed('tournament-bracket-tree-node-match-team', true).text(node.children[0].team);
+							teams.append('svg:tspan').text(" vs ");
+							var teamB = teams.append('svg:tspan').classed('tournament-bracket-tree-node-match-team', true).text(node.children[1].team);
+
+							var score = elem.append('svg:text').attr('y', nodeSize.realHeight / 5);
+							if (node.state === 'available')
+								score.text("Waiting");
+							else if (node.state === 'inprogress')
+								score.append('svg:a').attr('xlink:href', app.root + toRoomid(node.room).toLowerCase()).classed('ilink', true).text("In-progress");
+							else if (node.state === 'finished') {
+								if (node.result === 'win') {
+									teamA.classed('tournament-bracket-tree-node-match-team-win', true);
+									teamB.classed('tournament-bracket-tree-node-match-team-loss', true);
+								} else if (node.result === 'loss') {
+									teamA.classed('tournament-bracket-tree-node-match-team-loss', true);
+									teamB.classed('tournament-bracket-tree-node-match-team-win', true);
+								} else {
+									teamA.classed('tournament-bracket-tree-node-match-team-draw', true);
+									teamB.classed('tournament-bracket-tree-node-match-team-draw', true);
+								}
+
+								elem.classed('tournament-bracket-tree-node-match-result-' + node.result, true);
+								score.text(node.score.join(" - "));
+							}
+						}
+					}
+
+					if (node.parent && node.parent.state === 'finished')
+						if (node.parent.result === 'draw')
+							elem.classed('tournament-bracket-tree-node-draw', true);
+						else if (node.team === node.parent.team)
+							elem.classed('tournament-bracket-tree-node-win', true);
+						else
+							elem.classed('tournament-bracket-tree-node-loss', true);
+				});
+
+				return $div;
+			} else if (data.type === 'table') {
+				if (data.tableContents.length === 0)
+					return;
+
+				var $table = $('<table class="tournament-bracket-table"></table>');
+
+				var $colHeaders = $('<tr><td class="empty"></td></tr>');
+				$table.append($colHeaders);
+				data.tableHeaders.cols.forEach(function (name) {
+					$colHeaders.append($('<th></th>').text(name));
+				});
+
+				data.tableHeaders.rows.forEach(function (name, r) {
+					var $row = $('<tr></tr>');
+					$table.append($row);
+					$row.append($('<th></th>').text(name));
+					data.tableContents[r].forEach(function (cell) {
+						var $cell = $('<td></td>');
+						$row.append($cell);
+						if (!cell) {
+							$cell.addClass('tournament-bracket-table-cell-null');
+							return;
+						}
+						$cell.addClass('tournament-bracket-table-cell-' + cell.state);
+						if (cell.state === 'unavailable')
+							$cell.text("Unavailable");
+						else if (cell.state === 'available')
+							$cell.text("Waiting");
+						else if (cell.state === "inprogress")
+							$cell.html('<a href="' + app.root + toRoomid(cell.room).toLowerCase() + '" class="ilink">In-progress</a>');
+						else if (cell.state === 'finished') {
+							$cell.addClass('tournament-bracket-table-cell-result-' + cell.result);
+							$cell.text(cell.score.join(" - "));
+						}
+					});
+					$row.append($('<th class="tournament-bracket-row-score"></th>').text(data.scores[r]));
+				});
+
+				return $table;
+			}
+		},
+
+		TournamentBox.prototype.renderChallengeUsers = function () {
+			return '<button class="select" value="' + toId(this.challenges[0]) + '" name="tournamentButton" data-type="challengeUser">' + Tools.escapeHTML(this.challenges[0]) + '</button>';
+		};
+		TournamentBox.prototype.challengeUser = function (user, button) {
+			app.addPopup(UserPopup, {user: user, users: this.challenges, sourceEl: button});
+		};
+
+		TournamentBox.prototype.challengeTeam = function (team, button) {
+			app.addPopup(TeamPopup, {team: team, format: this.info.format, sourceEl: button});
+		};
+
+		return TournamentBox;
+	})();
+
+	var UserPopup = this.Popup.extend({
+		initialize: function (data) {
+			this.$el.html('<ul class="popupmenu">' + data.users.map(function (user) {
+				return '<li><button name="selectUser" value="' + Tools.escapeQuotes(user) + '"' + (user === data.user ? ' class="sel"' : '') + '>' + Tools.escapeHTML(user) + '</button></li>';
+			}).join('') + '</ul>');
+		},
+		selectUser: function (user) {
+			this.sourceEl.val(toId(user)).text(user);
+			this.close();
+		}
+	});
+
+}).call(this, jQuery);
diff --git a/js/client-chat.js b/js/client-chat.js
index bb27b7280..2ad1f6729 100644
--- a/js/client-chat.js
+++ b/js/client-chat.js
@@ -394,7 +394,7 @@
 			switch (cmd.toLowerCase()) {
 			case 'challenge':
 				var targets = target.split(',').map($.trim);
-				
+
 				if (!targets[0]) targets[0] = prompt('Who?');
 				target = toId(targets[0]);
 				this.challengeData = { userid: target, format: targets[1] || '', team: targets[2] || '' };
@@ -635,7 +635,7 @@
 		maxWidth: 1024,
 		isSideRoom: true,
 		initialize: function() {
-			var buf = '<ul class="userlist" style="display:none"></ul><div class="chat-log"><div class="inner"></div></div></div><div class="chat-log-add">Connecting...</div>';
+			var buf = '<ul class="userlist" style="display:none"></ul><div class="tournament-wrapper"></div><div class="chat-log"><div class="inner"></div></div></div><div class="chat-log-add">Connecting...</div>';
 			this.$el.addClass('ps-room-light').html(buf);
 
 			this.$chatAdd = this.$('.chat-log-add');
@@ -643,6 +643,9 @@
 			this.$chat = this.$('.inner');
 			this.$chatbox = null;
 
+			this.$tournamentWrapper = this.$('.tournament-wrapper');
+			this.tournamentBox = null;
+
 			this.users = {};
 			this.userCount = {};
 
@@ -663,12 +666,15 @@
 				this.$userList.show();
 				this.$chatFrame.addClass('hasuserlist');
 				this.$chatAdd.addClass('hasuserlist');
+				this.$tournamentWrapper.addClass('hasuserlist');
 			} else {
 				this.$userList.hide();
 				this.$chatFrame.removeClass('hasuserlist');
 				this.$chatAdd.removeClass('hasuserlist');
+				this.$tournamentWrapper.removeClass('hasuserlist');
 			}
 			this.$chatFrame.scrollTop(this.$chat.height());
+			if (this.tournamentBox) this.tournamentBox.updateLayout();
 		},
 		show: function() {
 			Room.prototype.show.apply(this, arguments);
@@ -818,6 +824,13 @@
 					});
 					break;
 
+				case 'tournament':
+				case 'tournaments':
+					if (!this.tournamentBox) this.tournamentBox = new TournamentBox(this, this.$tournamentWrapper);
+					if (!this.tournamentBox.parseMessage(row.slice(1), row[0] === 'tournaments'))
+						break;
+					// fallthrough in case of unparsed message
+
 				case '':
 					this.$chat.append('<div class="notice">' + Tools.escapeHTML(row.slice(1).join('|')) + '</div>');
 					break;
@@ -828,6 +841,9 @@
 				}
 			}
 		},
+		tournamentButton: function(val, button) {
+			if (this.tournamentBox) this.tournamentBox[$(button).data('type')](val, button);
+		},
 		parseUserList: function(userList) {
 			this.userCount = {};
 			this.users = {};
diff --git a/js/lib/d3.v3.min.js b/js/lib/d3.v3.min.js
new file mode 100644
index 000000000..b1a357c59
--- /dev/null
+++ b/js/lib/d3.v3.min.js
@@ -0,0 +1,33 @@
+/*
+	Copyright (c) 2013, Michael Bostock
+	All rights reserved.
+
+	Redistribution and use in source and binary forms, with or without
+	modification, are permitted provided that the following conditions are met:
+
+	* Redistributions of source code must retain the above copyright notice, this
+	  list of conditions and the following disclaimer.
+
+	* Redistributions in binary form must reproduce the above copyright notice,
+	  this list of conditions and the following disclaimer in the documentation
+	  and/or other materials provided with the distribution.
+
+	* The name Michael Bostock may not be used to endorse or promote products
+	  derived from this software without specific prior written permission.
+
+	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+	AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+	IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+	DISCLAIMED. IN NO EVENT SHALL MICHAEL BOSTOCK BE LIABLE FOR ANY DIRECT,
+	INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+	BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+	DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+	OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+	NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+	EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+d3=function(){function n(n){return null!=n&&!isNaN(n)}function t(n){return n.length}function e(n){for(var t=1;n*t%1;)t*=10;return t}function r(n,t){try{for(var e in t)Object.defineProperty(n.prototype,e,{value:t[e],enumerable:!1})}catch(r){n.prototype=t}}function u(){}function i(){}function o(n,t,e){return function(){var r=e.apply(t,arguments);return r===t?n:r}}function a(n,t){if(t in n)return t;t=t.charAt(0).toUpperCase()+t.substring(1);for(var e=0,r=Do.length;r>e;++e){var u=Do[e]+t;if(u in n)return u}}function c(){}function l(){}function s(n){function t(){for(var t,r=e,u=-1,i=r.length;++u<i;)(t=r[u].on)&&t.apply(this,arguments);return n}var e=[],r=new u;return t.on=function(t,u){var i,o=r.get(t);return arguments.length<2?o&&o.on:(o&&(o.on=null,e=e.slice(0,i=e.indexOf(o)).concat(e.slice(i+1)),r.remove(t)),u&&e.push(r.set(t,{on:u})),n)},t}function f(){mo.event.preventDefault()}function h(){for(var n,t=mo.event;n=t.sourceEvent;)t=n;return t}function g(n){for(var t=new 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diff --git a/style/client.css b/style/client.css
index 23352be09..f4749fadc 100644
--- a/style/client.css
+++ b/style/client.css
@@ -963,6 +963,181 @@ a.ilink:hover {
 	font-family: Verdana, Helvetica, Arial, sans-serif;
 }
 
+/* Tournaments */
+
+.tournament-wrapper {
+	display: none;
+	position: absolute;
+	top: 0;
+	left: 0;
+	right: 0;
+	height: 2em;
+	line-height: 2em;
+	text-align: center;
+	border-bottom: 1px #aaa solid;
+}
+.tournament-wrapper.active {
+	display: block;
+}
+.tournament-wrapper.active + .chat-log {
+	top: 2.4em;
+}
+
+.tournament-title {
+	font-weight: bold;
+	cursor: pointer;
+}
+
+.tournament-box {
+	position: absolute;
+	top: 2em;
+	left: 0;
+	right: 0;
+	z-index: 1;
+	line-height: 1em;
+	border-bottom: 1px #aaa solid;
+	background-color: rgba(242, 247, 250, 0.85);
+	max-height: 0;
+	overflow: hidden;
+	transition: max-height 0.5s ease-in-out;
+	-o-transition: max-height 0.5s ease-in-out;
+	-moz-transition: max-height 0.5s ease-in-out;
+	-webkit-transition: max-height 0.5s ease-in-out;
+}
+
+.tournament-bracket {
+	max-height: 200px;
+	padding: 10px;
+	overflow: hidden;
+	font-size: 8pt;
+}
+.tournament-bracket-overflowing {
+	height: 200px;
+	padding: 0;
+	position: relative;
+	left: 0;
+	top: 0;
+}
+
+.tournament-bracket-table {
+	margin: 0 auto;
+	empty-cells: hide;
+	border-bottom: 1px #aaa solid;
+	border-collapse: collapse;
+}
+.tournament-bracket-table td, .tournament-bracket-table th {
+	border: 1px #aaa solid;
+	padding: 5px;
+}
+.tournament-bracket-table td {
+	white-space: nowrap;
+}
+.tournament-bracket-table .empty,
+.tournament-bracket-table .tournament-bracket-table-cell-null {
+	border-width: 0;
+}
+.tournament-bracket-table-cell-result-win {
+	background-color: rgba(0, 255, 0, 0.2)
+}
+.tournament-bracket-table-cell-result-draw {
+	background-color: rgba(255, 255, 0, 0.2)
+}
+.tournament-bracket-table-cell-result-loss {
+	background-color: rgba(255, 0, 0, 0.2)
+}
+
+.tournament-bracket-tree-link {
+	fill: none;
+	stroke: #aaa;
+}
+.tournament-bracket-tree-link-active {
+	stroke: #aa0;
+	stroke-width: 3px;
+}
+.tournament-bracket-tree-node > rect {
+	/* Note: Due to SVG limitations, dimensions and border radii are in client-tournament.js (nodeSize) */
+	fill: rgba(225, 232, 242, 0.7);
+	stroke: rgba(178, 183, 191, 0.7);
+}
+.tournament-bracket-tree-node-win > rect {
+	fill: rgba(0, 255, 0, 0.2);
+	stroke: rgba(0, 255, 0, 0.5);
+}
+.tournament-bracket-tree-node-draw > rect {
+	fill: rgba(255, 255, 0, 0.2);
+	stroke: rgba(255, 255, 0, 0.5);
+}
+.tournament-bracket-tree-node-loss > rect {
+	fill: rgba(255, 0, 0, 0.2);
+	stroke: rgba(255, 0, 0, 0.5);
+}
+.tournament-bracket-tree-node > text {
+	font-size: 0.8em;
+	text-anchor: middle;
+	dominant-baseline: central;
+}
+.tournament-bracket-tree-node > text > a {
+	fill: #248;
+}
+.tournament-bracket-tree-node > text > a:hover {
+	fill: #68c;
+}
+.tournament-bracket-tree-node-match-team {
+	font-weight: bold;
+}
+.tournament-bracket-tree-node-match-team-draw, .tournament-bracket-tree-node-match-team-loss {
+	fill: #aaa;
+}
+
+.tournament-tools {
+	padding: 10px;
+	display: none;
+	border-top: 1px #aaa solid;
+}
+.tournament-tools.active {
+	display: block;
+}
+
+.tournament-join,
+.tournament-leave {
+	display: none;
+}
+.tournament-join.active,
+.tournament-leave.active {
+	display: inline;
+}
+
+.tournament-nomatches,
+.tournament-challenge,
+.tournament-challengeby,
+.tournament-challenging,
+.tournament-challenged {
+	display: none;
+}
+.tournament-nomatches.active,
+.tournament-challenge.active,
+.tournament-challengeby.active,
+.tournament-challenging.active,
+.tournament-challenged.active {
+	display: block;
+}
+
+div[class^='tournament-message-'], div[class*=' tournament-message-'] {
+	font-weight: bold;
+}
+.tournament-message-end-bracket {
+	font-weight: normal !important;
+	max-height: 400px;
+	overflow: hidden;
+	text-align: center;
+}
+.tournament-message-end-bracket-overflowing {
+	height: 400px;
+	position: relative;
+	left: 0;
+	top: 0;
+}
+
 /* Messages */
 
 .message-announce {
@@ -1030,7 +1205,8 @@ a.ilink:hover {
 	overflow-scrolling: touch;
 }
 .chat-log.hasuserlist,
-.chat-log-add.hasuserlist {
+.chat-log-add.hasuserlist,
+.tournament-wrapper.hasuserlist {
 	left: 146px;
 }
 .userlist,
diff --git a/testclient.html b/testclient.html
index 5dbd64d17..4fc74e058 100644
--- a/testclient.html
+++ b/testclient.html
@@ -86,6 +86,7 @@
 		<script src="js/lib/html-sanitizer-minified.js"></script>
 		<script src="js/lib/lodash.compat.js"></script>
 		<script src="js/lib/backbone.js"></script>
+		<script src="js/lib/d3.v3.min.js"></script>
 
 		<script>
 			document.getElementById('loading-message').innerHTML += ' DONE<br />Loading data...';
@@ -107,6 +108,7 @@
 		<script src="js/client-teambuilder.js"></script>
 		<script src="js/client-ladder.js"></script>
 		<script src="js/client-chat.js"></script>
+		<script src="js/client-chat-tournament.js"></script>
 		<script src="js/client-battle.js"></script>
 		<script src="js/client-rooms.js"></script>
 		<script src="js/storage.js"></script>