2011 ATP World Tour Finals – Singles

Defending champion Roger Federer defeated Jo-Wilfried Tsonga in the final, 6–3, 6–7, 6–3 to win the singles tennis title at the 2011 ATP World Tour Finals. It was a then-record sixth Tour Finals title and his 70th career title.

Mardy Fish and Janko Tipsarević (as an alternate who replaced Andy Murray) made their debuts at the event.