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Coco Gauff has become the first American teenager since Serena Williams more than two decades ago to reach the U.S. Open quarterfinals in consecutive years. She got that far this time by beating Caroline Wozniacki 6-3, 3-6, 6-1 on Sunday. Gauff asked one of her coaches to stop talking to her as the second set slipped away. She wound up winning the last six games. Gauff is 19. Wozniacki is a 33-year-old mother of two and was playing in just her third tournament since coming out of retirement last month. Frances Tiafoe and Ben Shelton set up an all-American men's quarterfinal with wins on the hottest day of the event so far.