Former world No 1 Caroline Wozniacki is out of Wimbledon after losing to Shuai Zhang in the third round on Friday.
The 14th seed looked to be cruising, leading 4-0 in the opening set, before a stunning collapse which saw the Chinese win 12 of the next 14 games to earn a 6-4, 6-2 win.
Wozniacki was not happy on Court Three, regularly complaining about line calls and Hawkeye while Zhang followed up her first-round win over 23rd seed Caroline Garcia.
Meanwhile, eighth seed Elina Svitolina is through to the fourth round for the second time in her career after she beat Maria Sakkari.
The Ukrainian made hard work of it, though, eventually winning 6-3 6-7 (1) 6-2 on the seventh match point.
Zhang had never advanced past the first round in the singles at the All England club.
She tweeted: "Can you believe I never win one match before 2019? Thanks very much all crowd to visiting and supporting @Wimbledon."
On Hawkeye, Wozniacki said: "I thought there were a few ones that I saw way differently. But it is what it is. You can't really change a Hawkeye call.
"Maybe it was right. I just saw it differently. But you trust Hawkeyenormally. You trust that it tells you the right thing.
"Sometimes you do see the balls a little differently than what the Hawkeye is. At least you know, OK, you can get it out of your mind.
"I do believe that it was not in the ideal place today."
Wozniacki also said the umpire was agreeing with her during her protests.
"He saw it differently and the linesmen saw it differently, as well," she said. "But then again, there's nothing you can do about it. It is what it is."
