By Nate Williams

LONDON — World No. 1 Simona Halep crashed out of Wimbledon following a stunning 3-6, 6-4, 7-5 upset by Taiwan’s Hsieh Su Wei in the third round on Saturday.

There were 13 breaks of serve overall in a seesaw contest and Halep took the first set after building a 4-2 lead.

Hsieh, who has never reached the last 16 at Wimbledon, stepped up her game in the second set as she broke twice to level the match.

“I gave everything I had on the game side,” Halep said. “I was fighting till the end for every ball. I just was too negative to myself, talking too much. I think, because I was tired, because I’m tired, I couldn’t stay focused for every ball.

“I was leading the match, I was up, and I couldn’t finish it.”

Halep, the French Open champion, looked like she would escape after forcing match point at 5-4 against serve in the third, but Hsieh rallied before breaking again en route to serving out the victory.

“This is the first time I have beaten the world number one, it is amazing,” Hsieh said. “She (Halep) played amazing, I had to run and fight for every point. I tried to concentrate on my game and calm down a bit, that helped a lot.”

Hsieh will play meet Slovakia’s Dominika Cibulkova on Monday after she bested Belgian Elise Mertens 6-2, 6-2.

Nine of the women’s top-10 seeds have now exited during the first week of competition, with only seventh seed Karolina Pliskova remaining.

Meanwhile on Centre Court, three-time champion Novak Djokovic battled back from a set down to defeat Britain’s Kyle Edmund 4-6, 6-3, 6-2, 6-4, despite a double-bounce controversy.

At 3-3 in the fourth set, with Djokovic leading two sets to one and Edmund on serve, the Serbian played a drop-shot on break point at 15-40.

Edmund sprinted from the baseline, chipped a return and was awarded the point. Djokovic challenged, arguing that there had been a double-bounce. The umpire didn’t agree and Edmund went on to win the game.

But the point should have been given to Djokovic. Firstly, the ball was out, as later revealed by Hawk-Eye on British television. Secondly, Edmund touched the net after his chase.

However, Djokovic eventually got the break he needed after a misfired half-volley from Edmund before clinching the match on serve with an ace after two hours and 54 minutes.

Over on Court One, fourth seed Alexander Zverev made another shocking exit as Latvian Ernests Gulbis conquered the German world No. 3 in five sets 7-6 (7-2), 4-6, 5-7, 6-3, 6-0.

Earlier, Rafael Nadal had no problems in making the last 16 as he cruised to a dominant 6-1, 6-2, 6-4 triumph over Australian Alex de Minaur.

De Minaur valiantly saved two match points before Nadal confirmed victory with a short, sharp volley.

“(It’s) very positive to be already in the second week, winning three matches,” said Nadal, who will retain his world No. 1 status on Monday.

Nadal will play Czech Republic’s Jiri Vesely next after he conquered Italian Fabio Fognini 7-6 (7-4), 3-6, 6-3, 6-2.

Fifth seed Juan Martin del Potro advanced with a 6-4, 7-6 (7-4), 6-3 victory over Frenchman Benoit Paire.

Canada’s Milos Raonic completed his delayed match from Friday as he came back to defeat Austrian Dennis Novak 7-6 (7-5), 4-6, 7-5, 6-2.

In the women’s draw, Belgium’s Alison van Uytvanck, who dismissed last year’s champion Garbine Muguruza in the previous round, continued her progress in a confident 6-2, 6-3 triumph over Estonian Anett Kontaveit.

Van Uytvanck will meet Russian 14th seed Daria Kasatkina, who beat Australia’s Ashleigh Barty 7-5, 6-3.

Germany’s Angelique Kerber is through following her 6-2, 6-4 win over Japan’s Naomi Osaka, and Jelena Ostapenko advanced with a 6-0, 6-4 result against Russian Vitalia Diatchenko.