Federer had to go play Rotterdam to sneak in a cheap 500 and 21 tournaments vs 19 for Novak. Despite this Federer has less than a 100 points lead right now.
Don't care who is number 1 at the end of the year, I just want Novak to win the US open.
Counting seems to be going out of fashion. Federer has not played 21 tournaments in the past 12 months. This year he has played 12, as you can see from the fact that he has lost 6 tournament matches, won 5 tournaments and withdrawn from 1. Last year from this point on he played Cincinnatti, US Open, Basel, Paris and WTF. So 17 tournaments is correct, or 18 if you count DC.