ATP World Tour Finals groups set
Federer beat Nadal in last year's ATP final, but the second-ranked Spaniard still leads their head-to-head series 17-8. Their most recent meeting was in the French Open final, when Nadal beat Federer for the title at Roland Garros for the fourth time.
However, Federer is coming off two straight tournament victories. He won in his hometown of Basel, and on Sunday earned his first Paris Masters title. Nadal hasn't played since losing at the Shanghai Masters last month.
Federer will open against Tsonga on Sunday, while Nadal and Fish will play in the late match. The winners will meet in the next round, ensuring that only one player has two wins heading into the third matches.
Federer and Nadal have combined to finish the season as the top-ranked player every time since 2004, but this year that honor will go to Djokovic.
The top-ranked Serb enjoyed a breakthrough season this year, winning the Australian Open, Wimbledon and U.S. Open. His only loss at a Grand Slam tournament in 2011 came in the semifinals of the French Open, where he lost to eventual runner-up Federer.
But Djokovic, who has been dealing with injuries since the U.S. Open, pulled out of the Paris Masters before his quarterfinal match last week against Tsonga because of shoulder pain.
Copyright 2011 by The Associated Press
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