The magnificent eight of men's tennis

Updated 4:15 PM ET, Sun November 3, 2013
Roger Federer tour finalsRoger Federer tour finals
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Since moving to London in 2009 more than one million people have attended the World Tour Finals, making it the world's biggest indoor tennis tournament. Former world No. 1 Roger Federer has won a record six World Tour Finals titles. Julian Finney/Getty Images
Spain's Rafael Nadal may be top of the world rankings, but he has never won a World Tour Finals title. EMMANUEL DUNAND/AFP/Getty Images
Serbia's Novak Djokovic is a two-time champion at the season-ending event, winning it in both 2008 and 2012. Ronald Martinez/Getty Images
The closest world No. 3 David Ferrer has come to winning the competition is a defeat to Federer in the 2007 final. MIGUEL MEDINA/AFP/Getty Images
Stanislas Wawrinka is making his World Tour Finals debut. His qualification marks the first time that two Swiss players will be competing at the season finale. Clive Brunskill/Getty Images
Argentina's Juan Martin Del Potro was beaten in the first London final in 2009 by Russia's Nikolay Davydenko. Fabrice Coffrini/AFP/Getty
The tournament pits the top eight players in the world against each, but world No. 9 Richard Gasquet is heading to London due to the withdrawal of Wimbledon champion Andy Murray. Al Bello/Getty Images
Czech Republic's Tomas Berdych enjoyed his best World Tour Finals in 2011, when he reached the semifinals. Julian Finney/Getty Images