Coco Gauff (19) is the first American teenager to win the US Open since Serena Williams won the tournament in 1999 at 17.

Final score: Gauff 2-6 6-3 6-2.
[Photo: Karsten Moran for The New York Times]
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Coco Gauff (19) is the first American teenager to win the US Open since Serena Williams won the tournament in 1999 at 17.