"London is my priority now and I really want to win the World Tour Finals," the evergreen 36-year-old told Sky Sports. "I am very excited to have had the year that I have had and everything that comes from here is a bonus.
"Finishing the year as world number one is a long shot, and I don't think it will happen but if I play like this, who knows? Maybe I will get close again."
Shangai was Federer's first tournament since the U.S. Open and the confidence he gained from his opening matches helped him through a taxing schedule.
"It's been a tough week, five straight matches is always a test and a challenge for anybody's body, especially with the pressure rising," he said.
"I felt I was playing well all week and that settled my nerves because I was returning well from the (opening) match here against (Diego) Schwartzman.
"The serve only got better and I saved the best for last ... In a way, not surprising because I felt good all week -- I was ready."
The Swiss next headlines his home Basel International starting Oct. 21.
(Reporting by Aditi Prakash in Bengaluru; Editing by Ian Ransom)
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