The Swiss Tennis Superstar, Roger Federer remains the effective player he is as he moved past Kei Nishikori in the ATP World Tour Finals.

Federer is now the only undefeated player in their group after defeating Nishikori 6-3, 6-2 in 69 minutes at London's O2 Arena.

Federer said "For some reason he couldn't get it done. Maybe I was playing too well (on) defense and offense, mixing up my serve good enough. But I know that Kei can play better. So for me it was really important to take advantage of the fact that I was feeling really good, and then maybe he was struggling a little bit today."

Federer is now the oldest man to qualify for the year-end championships after 35-year-old Andre Agassi in 2005. But even so, his performance is putting him right above the rest as his reflexes and foot work is as fast as his movements.

He said "I think it's very much a game of movement and the baseline game. Whoever's better from the baseline has the upper hand, then dominates. I think that's why we're seeing heavy scorelines, because it's just hard to serve your way out of trouble. It's almost not possible time and time again. From that standpoint, I think the best movers are most likely going to come through here."

But aside from that, Federer can now vie for the year-end number 1 spot and move past Novak Djokovic if he sweeps to the title undefeated and wins one live Davis Cup rubber.

He lamented "It was never the goal to win world number one. My focus is rather to try to win the World Tour Finals here, then play a good (Davis Cup) finals next week. The rankings anyway are going to follow or not. I'm just pleased that I'm winning my matches right about now."

When asked about Djokovic, here is what he got to say "Novak looks great. No disrespect to the other players on the other side. I know they're going to have their chance against Novak, as well - Stan and [Tomas] Berdych. But I've played Novak here in previous years, and I know how tough he is to beat here."