The last three matches of the day were all pretty tough.  Gilles Simon kept even in the first set, but ran away with the first set tiebreak over Ryan Harrison as Harrison got frustrated.  He was up 5-2 in the second set, but Harrison won a series of games and took the second set.  Because Simon tends to grind out points very long, he was testing Harrison’s fitness.  Simon got several breaks and closed it out 76 57 61.

Federer was up next and had a tough time with Bellucci.  He also needed 3 sets, 36 63 64.  del Potro had the closest match, though the third set wasn’t so close in his win over Denis Istomin: 76 67 62

del Potro vs Federer will the star quarterfinal match.  There’s also Djokovic-Almagro, Nadal-Nalbandian, and Simon-Isner.  Isner beat Simon in last year’s US Open.