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Roger Federer extends his FedEx ATP Head2Head series lead against Kevin Anderson to 5-1 with a victory Thursday at the Nitto ATP Finals.

Roger Won't Let No. 100 Get In His Head

Federer through to the last four of the season finale for the 15th time

Entering Thursday at the Nitto ATP Finals, there was a chance Roger Federer would fail to reach the semi-finals at the season finale for just the second time in 16 appearances. But one impressive straight-sets win against fourth seed Kevin Anderson later, and the 37-year-old is through round-robin play atop Group Lleyton Hewitt.

Suddenly, a major milestone is within reach. If Federer wins two more matches, he will lift his 100th tour-level trophy, with Jimmy Connors (109 titles) the only other player who has achieved the feat.

“Personally I'm still not thinking of the number, 100. I won't let that get in my head, make me go crazy because it should be something I'm excited about and not something I should feel extra pressure [to earn],” Federer said. “It's just going to be hard to finish it. I'm happy I gave myself the opportunity. I'm happy that I'm raising my level of play throughout this week. This is what I hope to do. It's exciting to be in this situation now, of course, no doubt.”

Just four days ago, the Swiss lost a round-robin match at the Nitto ATP Finals in straight sets for the first time, so he knows that he has to take it one step at a time. That is part of what makes this tournament so special; every match poses a major challenge.

“I think regardless of the numbers, this is a massive tournament for the players. Of course, I can only speak for myself, but I've loved being part of the Tennis Masters Cup, today [the Nitto ATP] Finals,” Federer said. “I've always tried to pace myself in a way… that I would have something left in the tank, that I would peak at this event.”

And Federer has gotten better with every match at The O2 in 2018. After an exchange of breaks in the first set against tournament debutant Anderson, Federer used his backhand slice well to throw off the game of the South African, who had not faced break point in the entire event. Federer broke him four times.

“I'm feeling great,” Federer said. “I'm very happy that I still have energy left in the tank. Mentally, I feel fresh.”

And Federer’s secret sauce continues to work. The second seed took a day off of practice after losing to Kei Nishikori on Sunday. And that strategy has not failed him since.

“Look, I'm a big believer in vacation. I'm a big believer in taking time off sometimes. When I go to work, I go hard, I go the right way, I go professional about it with my team,” Federer said. “I didn't think of taking a day off, to be honest, after the Nishikori match. I thought, ‘What are we going to do? Where are we going to train?’”

But Federer’s team suggested taking a day off, and the Swiss heeded their advice. He did not practice on Wednesday after beating Dominic Thiem on Tuesday, and Federer says he doubts he will hit balls on Friday. Why change something if it’s not broken?

“It's one of the first times I've done it like that,” Federer said. “I'm happy it's paying off so far. But I’ve got to be very, very focused the moment I step on court for the practice, the warm-up. I think that's key, as well.”

And Federer will look to remain focused regardless of his opponent in the semi-finals. Novak Djokovic leads Group Guga Kuerten after two matches, with Marin Cilic, John Isner and Alexander Zverev still hoping to advance. Federer, this year’s Australian Open, Rotterdam, Stuttgart and Basel titlist, is now 57-14 at the Nitto ATP Finals. And while he’s triumphed at the tournament six times, the Swiss seeks his first victory since 2011.

“I'm happy that this is another week like this. Didn't look like it maybe 72 hours ago,” Federer said. “But I was able to come back and play good tennis.”