Updated: Sept. 12, 2021 at 9:13 PM

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.

Fernandez reacts to a winning shot. Photo by Corey Sipkin/UPI

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Novak Djokovic of Serbia hits a forehand to Alexander Zverev of Germany in the semi-finals of the 2021 U.S. Open Tennis Championships at the Billie Jean King National Tennis Center on , September 10, 2021, in Flushing, N.Y. Photo by John Angelillo/UPI

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Zverev serves to Djokovic. Photo by John Angelillo/UPI

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Felix Auger Aliassime of Canada hits a forehand to Daniil Medvedev of Russia before losing the semi-final match in straight sets in the 2021 U.S. Open Tennis Championships at the Billie Jean King National Tennis Center on September 10, 2021, in Flusing, N.Y. Photo by John Angelillo/UPI

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