Coco Gauff's run through Wimbledon continues.

The American teenager saved two match points in the second set, won a tiebreaker and then outlasted Slovenia's Polona Hercog for a 3-6, 7-6 (7), 7-5 victory in the third round Friday.

Gauff, 15, is the youngest player to come through qualifying for Wimbledon in the Open era. She reached the third round by upsetting Venus Williams then beating former semifinalist Magdalena Rybarikova.

Also in the women's draw, two former No. 1s advanced to the fourth round and another two lost in the third round.

Third-seeded Karolina Pliskova defeated Su-Wei Hsieh 6-3, 2-6, 6-4, while 14th-seeded Caroline Wozniacki lost to Zhang Shuai 6-4, 6-2. In a match between two former top-ranked players, Simona Halep beat Victoria Azarenka 6-3, 6-1 on Centre Court.

Wozniacki was leading 4-0 in the first set and also broke Zhang in the opening game of the second before losing four straight games. The Dane repeatedly grew frustrated with the result of Hawk-Eye challenges, complaining to the chair umpire on several occasions that the calls made by the review system were wrong.

"I thought there was a few ones that I saw way differently," Wozniacki said. "But it is what it is. You can't really change a Hawk-Eye call."

Information from The Associated Press was used in this report.