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U.S. Open Day 1 After Dark: Djokovic wins, Keys survives, Sock outlasts Fritz

NEW YORK - A recap of the opening Monday night's action at the 2016 U.S. Open, including results, tweets, hot shots, photos and more.

Defending U.S. Open men's singles champion Novak Djokovic advanced to the second round of the 2016 tournament on Monday, beating Jerzy Janowicz in four sets.

It wasn't easy for the world No. 1, who appeared to experience discomfort near his right elbow throughout the match.

Elsewhere, No. 5 seed Milos Raonic blew past Dustin Brown in straight sets, while American Jack Sock beat compatriot Taylor Fritz in five sets. Read more about Monday evening's matches below.