Who would have thought that would have been possible after the year he has had?
Novak Djokovic had the best year in tennis history; Andy Murray looked to be heading into London in sensational form, and you can never discount Rafael Nadal. After winning Basel and Paris, Federer is the man to beat in London.
This week, the No. 4 Federer has been untouchable and he comfortably defeated Jo-Wilfried Tsonga in Sunday's final, 6-1, 7-6 (3).
Assuming Federer is the favourite, his closest rival will likely be Murray after his recent wins in Bangkok, Tokyo and Shanghai.
With Djokovic suffering a shoulder injury, there will be concerns about whether he can perform to his absolute best while Nadal pulled out of Paris in order to prepare for the World Tour Finals. Can either really be a match for an in-form Federer?
The former No. 1 seems to be the man to beat at the moment but it is worth noting that over the last two weeks Federer has only played Tomas Berdych and Tsonga among potential London matchups, and has lost seven matches against the top three this year.