ATP Finals: Meet the last 5 players to have won the season-ending championship

#2 Novak Djokovic (2008, 2012-15)

Novak Djokovic celebrates his 2015 ATP Finals title

In a dominant 2015 season, the Serb become the first player since Roger Federer (2009) to make the final at all four Grand Slam tournaments while also winning a record 6 Masters 1000 titles from a record 8 finals in the season.

Making his ninth consecutive appearance at the ATP Finals, Djokovic's 15-match winning streak at the tournament came to an end at the hands of Roger Federer in the second robin match. Nevertheless, the Serb ended as the group runner-up and beat Rafael Nadal in the semifinals to set up a rematch with Federer for the title.

Following victories over the Swiss maestro in 4 out of 6 title matches in the season (Indian Wells, Rome, Wimbledon, US Open), Djokovic emerged victorious in straight sets to become the first player in the tournament's history to win 4 consecutive titles.

#1 Roger Federer (2003-04, 2006-07, 2010-11)

Roger Federer hoists aloft his record-sixth ATP Finals title in 2011

Roger Federer holds many records at the ATP Finals: most appearances (17), most matches (72), most wins (57), most finals (10), most titles (6) and most semifinals (15).

Making his 10th consecutive appearance at the ATP Finals in 2011, Federer beat Jo-Wilfried Tsonga, Rafael Nadal and Mardy Fish in the group stage, to make his 9th consecutive semifinal at the tournament. There, he beat David Ferrer in straight sets to set up a rematch with Tsonga for the title.

Playing his 3rd match with the Frenchman in the space of two weeks (2011 Paris Masters final, 2011 ATP Finals round-robin), Federer beat Tsonga in three sets to become the first 6-time champion at the ATP Finals.

In the process, the then 30-year-old Federer became the oldest player to triumph at the season-finale tournament.