Highlights from the U.S. Open tennis tournament (59 images)

The U.S. Open tennis tournament opened with first rounds in Arthur Ashe Stadium at the USTA Billie Jean King National Tennis Center in Flushing, N.Y., on August 31, 2021. Here's a look at some highlights.

Djokovic celebrates after defeating Tallon Griekspoor in straight sets in the second round at Arthur Ashe Stadium on September 2. Photo by John Angelillo/UPI

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Nishikori hits a running forehand to Mackenzie McDonald on Court 17. Photo by John Angelillo/UPI

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Alexander Zverev hits a backhand in the third set before defeating Albert Ramos-Vinolas in straight sets. Photo by John Angelillo/UPI

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Bianca Andreescu hits a backhand in her match against Lauren Davis. Photo by John Angelillo/UPI

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