Jack Sock is into the round of 16 at the U.S. Open for the first time, and he's happy about it.
Keep up with all the action from the U.S. Open with our Day 5 Live Blog
The Bulgarian may have just happened upon a new celebration!
Heat and humidity of New York suit the No. 8 seed.
The Frenchman is not known for his backhand prowess. But shots like this could change that perception.
The man, the myth, the Monf. He's pure box office, no matter the weather.
The two-time U.S. Open champion has yet to defeat the roof over Arthur Ashe Stadium.
