Defending champion Coco Gauff lost in the U.S. Open’s fourth round to Emma Navarro 6-3, 4-6, 6-3 in an all-American matchup on Sunday, unable to overcome a poor performance that included more double-faults, 19, than winners, 14.

The No. 3-seeded Gauff had won 10 matches in a row at Flushing Meadows, including the run to her first Grand Slam title a year ago.

Four of those came after she dropped the opening set — including in the 2023 final and in her third-round victory on Friday — but the 20-year-old from Florida could not complete the comeback this time. That’s despite a mid-match, four-game run in which she claimed 14 of 17 points to steal the second set and get off to a good start in the third.

After each of her past two contests in New York, Gauff headed back out onto the practice courts to work on her serve. That didn’t help much on Sunday, which saw a trio of double-faults in each of three games — two of which she lost, at 1-all in the first set and, more significantly, at 1-all in the third. Eleven of the double-faults came in the final set alone.

Aside from those issues, Gauff finished with a total of 60 unforced errors — a whopping 29 on her forehand side, the biggest weakness in her game. The 23-year-old Navarro, who also eliminated Gauff in the fourth round at Wimbledon in July, was far steadier on Sunday and had 35 unforced errors.

This result follows the surprising third-round loss by defending men’s champion Novak Djokovic on Friday night, meaning the lengthy droughts without anyone winning consecutive titles in New York will continue. The last woman to win at least two in a row was Serena Williams with three from 2012-14; the last man was Roger Federer with five from 2004-08.

The Wimbledon win over Gauff earned Navarro, the 2021 NCAA singles champion for the University of Virginia, her first appearance in a major quarterfinal. Her second will come Tuesday in New York against No. 26 Paula Badosa, a 6-1, 6-2 winner against Wang Yafan.