Does Federer just have to perform better than Rafa at USOpen or does he have to win it all by at least two rounds difference?
It will depend on what Rafa does at Cincinnati. Too many options to calculate now, but if he wins it then Rog probably won't be able to do it at the Open without winning it AND Rafa losing within the first 3-4 rounds.
It's looking much better in the race where Rog is behind only 50 points (currently). However, his health issues now have to come into the equation and it might just be a bridge too far for him. Still had a great run this year, so nobody should really complaint, we all knew this was always a possibility.