Defending champion Garbine Muguruza was sensationally knocked out of Wimbledon by journeywoman Alison van Uytvanck, leaving just one of the top six seeds left after only two rounds.

Belgian 47th-ranked Van Uytvanck triumphed 5-7, 6-2, 6-1 for her first-ever win over a top 10 opponent.

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Muguruza’s defeat leaves just top seed Simona Halep, number seven Karolina Pliskova and 10th seed Madison Keys as the remaining top-ranked contenders after two rounds.

In the men’s event, third seed and last year’s runner-up Marin Cilic was knocked out by Argentina’s Guido Pella.

Fourth seed Alexander Zverev was teetering on the brink of defeat when he trailed Taylor Fritz of the United States by two sets to one when their second round tie was suspended for the night.

Elsewhere, Rafael Nadal overcame two time warnings and Novak Djokovic shrugged off a knee problem to battle into the third round.

“I knew that if I let her play, I would lose so I thought, let’s go for it,” said 24-year-old Van Uytvanck, who has made the third round for the first time.

“I may have looked calm but inside I was dying.” Muguruza admitted it had not been her day.

“She played big, took risks and it worked for her but my level was not where I wanted it to be,” said the deposed champion.

“It’s a little bit sad.”

World number one Nadal defeated Mikhail Kukushkin of Kazakhstan 6-4, 6-3, 6-4 and will next face Australian teenager Alex de Minaur.

Djokovic, the three-time champion, needed treatment on his left knee on Court Two but still had too much for Argentina’s Horacio Zeballos, winning 6-1, 6-2, 6-3.

Djokovic has now made the third round for 10 consecutive years and will face British 21st seed Kyle Edmund.

Cilic blew a two-set lead in his 3-6, 1-6, 6-4, 7-6 (7/3), 7-5 loss to Argentina’s Guido Pella, ranked at 82.

When rain forced the tie to be postponed on Wednesday, Cilic was leading by two sets against an opponent who had never won a match at Wimbledon before this year.

But the Croatian collapsed once the match resumed on Court One on Thursday and Pella took full advantage to set up a third round clash with Mackenzie McDonald of the United States.

Cilic, the 2014 US Open champion, had been expected to mount a strong challenge for the Wimbledon title after winning the grass-court warm-up at Queen’s Club two weeks ago.

But his defeat is good news for defending champion Roger Federer, who was on course to face Cilic in the semi-finals.

“Yesterday he was playing so good, hitting the ball so hard that I couldn’t do anything,” Pella said.

“So the rain helped me a lot. Today I played differently, tried to be more aggressive, he started to feel uncomfortable.”

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Nadal, the 2008 and 2010 champion, was tested by world number 77 Kukushkin who was made to pay for converting just two of 13 break points.

He was also hit with two time violations — one before the match had even started as he sat courtside.

“I didn’t know but I don’t see a clock here. I don’t see a countdown. It’s more difficult for me to understand what’s going on,” said 11-time French Open champion Nadal, who is chasing an 18th major.

For Djokovic, meanwhile, victory was his 60th at Wimbledon.

He hit 15 aces and 31 winners in a commanding win over 33-year-old Zeballos, who was a top 40 player in 2013 but was playing at Wimbledon ranked a lowly 126.

Former world number one Djokovic shrugged off a knee injury he suffered in the match.

“It’s most likely a twitch in the muscle or something like this that has affected the knee a little bit. Hopefully it’s nothing that will concern me,” said Djokovic.

Three-time major winner Stan Wawrinka was unable to follow up his first round defeat of sixth seed Grigor Dimitrov when he lost 7-6 (9/7), 6-3, 7-6 (8/6) to Italian qualifier Thomas Fabbiano.

Fifth-seeded Juan Martin del Potro, who made the semi-finals in 2013, eased past 36-year-old Feliciano Lopez, a three-time quarter-finalist, who was playing in a record 66th consecutive major.

Del Potro’s 6-4, 6-1, 6-2 win set-up a third round clash with France’s Benoit Paire.

John Isner, the US ninth seed, saved two match points, fired 64 aces and 88 winners to defeat Belgian qualifier Ruben Bemelmans 6-1, 6-4, 6-7 (6/8), 6-7 (3/7), 7-5.

Nick Kyrgios, seeded 15, unleashed 42 winners to see off Robin Haase of the Netherlands 6-3, 6-4, 7-5.

Kyrgios next faces Japan’s Kei Nishikori who put out Australian lucky loser Bernard Tomic 2-6, 6-3, 7-6 (9/7), 7-5.

French Open champion Halep reached the third round with a 7-5, 6-0 win over China’s Zheng Saisai and next plays Hsieh Su-Wei of Taiwan.