Roger Federer
Years Qualified: 11
Best Result: Won 2003-04, 2006-07, 2010-11

Six-time champion Roger Federer has qualified for an 11th time after a stunning season that saw him reclaim the World No. 1 ranking. The Swiss will enter this year's event as the two-time defending champion.

Novak Djokovic
Years Qualified: 6
Best Result: Won 2008, '12

Novak Djokovic, the 2008 champion, has qualified for a sixth successive year (9-9 record). Four years ago, the Serbian beat Nikolay Davydenko 6-1, 7-5 when the event was held in Shanghai.

Andy Murray
Years Qualified: 5
Best Result: Semi-finals 2008, 2010, '12

Andy Murray has qualified for a fifth straight year (7-5 event record). He has twice reached the semi-finals, including a memorable match against Rafael Nadal in 2010 decided in a third set tie-break.

David Ferrer
Years Qualified: 4
Best Result: Runner-up 2007

David Ferrer has qualified for a third straight year and a fourth time overall (6-6 event record). The Spaniard reached the final on his debut in 2007, falling to Roger Federer.

Tomas Berdych
Years Qualified: 3
Best Result: Semi-finals 2011

Tomas Berdych has qualified for the third straight year (3-4 event record). He reached the semi-finals in 2011, losing to Jo-Wilfried Tsonga 6-3, 7-5.

Juan Martin del Potro
Years Qualified: 3
Best Result: Runner-up 2009

Juan Martin del Potro, a winner of four ATP World Tour titles in 2012, has qualified for the first time since 2009 and the third time overall (4-4 event record). He reached the 2009 final, losing to Nikolay Davydenko 6-3, 6-4.

Jo-Wilfried Tsonga
Years Qualified: 3
Best Result: Runner-up 2011

Jo-Wilfried Tsonga has qualified for the second straight year and third time overall (4-3 event record). He reached the final in 2011, losing to Roger Federer 6-3, 6-7(6), 6-3

Janko Tipsarevic
Years Qualified: 1
Best Result: Group Stage 2011, '12

Janko Tipsarevic served as an alternate in 2011, going 1-1 in round robin play. He has qualified out-right for the first time this year.