Defending champion Coco Gauff crashed out of the fourth round of the U.S. Open with a 6-3 4-6 6-3 loss to fellow American Emma Navarro in New York on Sunday.Third-seeded Gauff was let down by her serve, producing 19 double faults, as Navarro, who knocked Gauff out of Wimbledon in July, reached the quarter-finals of the year’s last major.
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