With Nadal's knees apparently at "100%" and his tooth ache clearing up, there is a great possibility should the defending champion return to the final at Roland Garros, Rafael Nadal will be his opponent. I don't think Federer will be using his usual approach against Nadal. It's failed him five times at the French alone. I've seen more and more of Federer's drop shot, and I think this will be one of his aces should there be a rematch. Nadal likes to play 5+ feet behind the baseline, and I think proper use of this shot will force Nadal to either come to the net on weak retrievals, or play closer to the baseline where he does not have the time to take that extra step and retrieve the shot.