Roger Federer feels in an "ideal situation" heading into the last four of the ATP World Tour Finals after maintaining his perfect record in London at the expense of Kei Nishikori on Thursday.
The 17-time grand-slam champion was already assured of a place in the semi-finals of the season-ending tournament at the O2 Arena before his final Group Stan Smith match against Nishikori as a result of his victory over world number one Novak Djokovic.
Federer was not at his best, but still beat eighth seed Nishikori 7-5 4-6 6-4 to make it three round-robin wins out of three and seal top spot in his group.
The legendary Swiss will face Andy Murray or Stan Wawrinka in the last four and is more than happy with his physical condition as he attempts to win the tournament for a seventh time.
He said: "Honestly, I feel really good about my body. I've got the perfect schedule. I'm off before the semis, which is huge.
"Now you're looking at potentially a maximum of two more matches and the season's over then. It's easy for the mind now, in my opinion. There's no best-of-five-set matches to look forward to, so it should be pretty easy.
Asked who he would rather face in the semi-final, Federer said: "I have no preference. At this point everything is tough and fun at the same time because it's cool playing those kind of guys in the semis of the World Tour Finals.
"This is what it's about. This is where I wanted to be. Of course, I'm going to be happy to be there myself, seeing them battle it out tomorrow."