Another free pass for Djokovic

That Novak Djokovic would reach his 10th consecutive US Open semifinal should surprise no one. That he's done it by playing only two complete matches because three opponents pulled out of the tournament with injuries is as odd as can be.

Djokovic, the No 1 seed and defending champion, once again needed to put in very little work, advancing when No 9 Jo-Wilfried Tsonga stopped because of a hurt left knee after the first point of their quarterfinal's third set Tuesday night.

The first two sets went Djokovic's way 6-3, 6-2. At the ensuing changeover Tsonga was visited by a trainer and had his left leg taped below the knee. Tsonga double-faulted to begin the third set, then retired from the match.