Novak Djokovic, Naomi Osaka win U.S. Open Tennis Championships (117 images)

Top tennis professionals compete at the 2018 U.S. Open Tennis Championships at the USTA Billie Jean King National Tennis Center in New York City.

Nick Jonas and Priyanka Chopra watch Thiem play Nadal. Photo by John Angelillo/UPI

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Roger Federer of Switzerland reacts after losing a game to John Millman of Australia in their fourth round match on Monday. Photo by Ray Stubblebine/UPI

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Federer returns a shot from Millman in their fourth round match. Photo by Ray Stubblebine/UPI

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Millman returns a shot from Federer in their 4th round match. Photo by Ray Stubblebine/UPI

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