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.

Cilic serves in the quarterfinals against Nishikori. Photo by John Angelillo/UPI

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Serena Williams celebrates after match point in her straight sets quarterfinal match victory over Karolina Pliskova of the Czech Republic on Tuesday. Williams won 6-4, 6-3. Photo by John Angelillo/UPI

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Williams serves in her straight sets quarterfinal match victory over Pliskova. Photo by John Angelillo/UPI

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Pliskova reaches for a forehand in her straight sets quarterfinal defeat to Williams. Photo by John Angelillo/UPI

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