Mayonnaise
Banned
I have several times already, buddy. Though, while he was turning 31, Djokovic was winning toronto, followed by Cincy final, USO final, winning Beijing, Shanghai, WTFs, and the 2013 AO. So when Federer was 31, who was the best player in the world? Not asking who was ranked number 1, but who was the best player?
After turning 31, Fed went 20-5 for the rest of the season, Djokovic went 30-3.
Federer was the best at least until Cincinnati ended. If you're gonna be pedantic, Nadal stopped being the best player in the world after US Open 2013 and US Open 2010.