ATP World Tour Finals
» Federer beats Wawrinka 7-5, 6-3 in semifinal
» Djokovic outplays Rafael Nadal 6-3, 6-3
» Federer will now face Djokovic in final
» Perfect climax to the season between two players with 27 grand slam titles between them
Federer wins
London: Roger Federer set up a showdown with Novak Djokovic when he beat fellow Swiss Stanislas Wawrinka 7-5, 6-3 in their semifinal at the ATP World Tour Finals at the O2 Arena on Saturday.
The six-times champion fell 4-2 behind in the opening set but rattled off four consecutive games to move ahead and cruised through the second set with smooth efficiency.
Wawrinka saved a match point at 2-5 but 17-times grand slam champion Federer closed out victory in little more than an hour.
World number three Federer, who won all his group matches this week, has reached the final of the year-ender for the 10th time but has not won the title since 2011.
Last year, when he also beat Wawrinka in a gruelling semi-final, he conceded the final to Djokovic with a back strain.
Beating Djokovic has been beyond virtually every player this year but Federer has the chance to get the better of the Serb for the second time in a week on Sunday.
The 34-year-old ended Djokovic's 23-match winning streak on Tuesday with a classy straight-sets victory in the group stage of the ATP World Tour Finals but knows he will need to be at least as good to repeat that feat in the final.
Federer dispatched Wawrinka to keep alive his hopes of a seventh title at the year-ender, while Djokovic outplayed Rafael Nadal 6-3, 6-3.
It sets up the perfect climax to the season between two players with 27 grand slam titles between them.
But Federer says Tuesday's victory over world number one Djokovic will have no bearing on Sunday's showdown.
"For me it's an advantage because I guess it gives me a bit of confidence," Federer, who has accounted for half of Djokovic's meagre six defeats this year, told reporters.
"For him it's an advantage because he gets a second chance, and he's in another final. He's played some great tennis since we've played.
"So, yeah, I still believe his confidence is slightly higher than mine with the amount of success he's had this year."
Incredible year
Djokovic, who won three of the year's grand slams and has a career-best 81-6 record this season, is looking to crown an incredible year with an 11th title and fourth in succession at the O2 Arena.
Nadal described him as "almost unbeatable" on Saturday but the Serb still trails Federer 22-21 overall and says the Swiss plays a game he finds uncomfortable, especially over three sets rather than in grand slam play when Djokovic has the edge.
"I've lost against Roger three times this year. When he's on, it's hard to play him," said the world number one.
(With Agency inputs)