Andy Murray is still holding on to his mentality and states his new position as No 1 has not changed his thinking after his win over Marin Cilic.
The 29-year-old tennis star did not have a smooth start to his first match in the ATP World Tour Finals in London, but won 6-3 6-2 in the round-robin match.
The Scot had to save two break points in the first game, then dropped his serve in the third game, but blamed the conditions at the O2 Arena for his struggles and not nerves.
Speaking at his post-match press conference, he said: “I haven’t thought about it [becoming world No 1] too much. It didn’t change much for me.
“I didn’t feel any more nervous than usual. It’s just quite different conditions in there than what we have been practicing in during the week. It’s a lot slower than it has been.
“Obviously, playing with a packed crowd, it changes things a bit. I think maybe some of the errors at the beginning were more getting used to playing in new surroundings again.”
Murray has now won 20 games in succession and can make it 21 when he faces Kei Nishikori on Wednesday in his second round-robin match.
Nishikori saw off Wawrinka in a match he dominated 6-2 6-3 and could prove more of a challenge for the new world number one, than Marin Cilic did.
Murray added: “I didn’t see the match, but he obviously must have played very well. To win against a player like Stan with that scoreline, I don’t think Stan had really any chances on Kei’s serve either.
“I would say this is probably his best year that he has had on the tour.
“He is one of the best players in the world. He has been playing very well the last few months especially.”