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Serena Williams crashes out of Australian Open while Coco Gauff (15) stuns defending champion Osaka

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Serena Williams walks off the court after losing to China's Wang Qiang

Serena Williams walks off the court after losing to China's Wang Qiang

AFP via Getty Images

Serena Williams walks off the court after losing to China's Wang Qiang

Serena Williams' bid for a record-equalling 24th grand slam singles title at the Australian Open ended with a shock third-round loss while 15-year-old Coco Gauff stunned the defending champion Naomi Osaka.

Williams was ousted by China's Wang Qiang, who claimed a 6-4 6-7 (2) 7-5 victory, a vast improvement on her last meeting with Serena, when she won just one game and 15 points.

Williams won her first tournament in three years in Auckland earlier this month and arrived in Melbourne with a determined intensity that seemed to indicate she was ready to put four recent grand slam final losses behind her.

It would have been fitting, meanwhile, had the 38-year-old finally moved level with Margaret Court in Melbourne as the tournament marks the 50th anniversary of her calendar Grand Slam.

But, the more Williams was unable to pull away from Wang, the more the tension in her body grew.

The Chinese player broke serve in the ninth game of the opening set and served it out, but Williams showed just how much she wanted to win the match early in the second.

A shot striking the top of the net and dropping over resulted in the American roaring and clenching her fist, the customary apology nowhere to be seen.

Wang gave her opponent a glance but kept her focus on directing balls into the corners and drawing errors from her opponent.

There were plenty and, when Wang broke to lead 3-2 in the second set, it became clear this was more than just a wobble for the seven-time Melbourne champion.

Wang missed a chance to move 5-2 ahead but still had the opportunity to serve for the match at 5-4.

But the American's champion mentality kicked in and she played her best game of the match to break back, clinching it with a forehand winner at the end of a 24-shot rally and holding her arms aloft in celebration.

When the eighth seed won the tie-break comfortably, it seemed the danger had been averted, but Wang had other ideas and she kept her nose in front during the third set.

Meanwhile, Coco Gauff stunned defending champion Naomi Osaka, taking advantage of an error-strewn display from her opponent to win 6-3 6-4.

The teenager was stunned by her achievement, saying: "Two years ago I lost first round in juniors, and now I'm here. This is crazy.

"I was just telling myself one point at a time and keep fighting because you never know what happens on this court.

"I'm on Rod Laver Arena, I can't believe this."

Gauff said she had been too shy to speak to Laver when she had passed him in the corridor but hoped to set up a meeting and to take a selfie for Instagram.

Laver was quick to respond on Twitter, saying: "Hello Coco Gauff - congratulations on your incredible victory tonight. I would love to meet you too."

The American is the youngest player to beat a top-five ranked opponent since Jennifer Capriati toppled Gabriela Sabatini at the 1991 US Open.

While this was a spectacular day for Gauff, it was a desperately disappointing one for Osaka, who had battled so brilliantly to win her second grand slam title here 12 months ago but succumbed meekly and could now drop out of the top 10.

Gauff must have taken inspiration from Wang Qiang, who was brutally hit off the court by Serena Williams in New York last summer only to beat her on the same court earlier in the day.

What was clear from the start was how much Gauff's serve has improved and she comfortably kept Osaka at bay while displaying her remarkable composure for a player so new to this level.

Gauff would still be considered young in the juniors but there is no doubt she belongs on the biggest stages the sport has to offer.

She was trading well with Osaka from the back of the court and, as the first set progressed, it was the defending champion who started to snatch at her shots, missing a succession of backhands.

From 3-3, Gauff won three straight games to move a set in front and then broke the Osaka serve again at the start of the second set.

She had two chances to hold for 2-0 but could not take either and it seemed the chink of light that Osaka needed to get a foothold in the match again.

But the Japanese player simply was not playing well, and the unforced errors continued to flow.

Gauff broke again to lead 4-3 and, although Osaka forced her young opponent to serve it out, a comeback never looked on the cards.

Asked in her press conference what she could have done differently, Osaka said with a smile: "Put the ball in the court."

The third seed said Gauff had played more aggressively and served better than in their New York meeting and she attributed her own poor performance to nerves and "an age problem".

"I feel like I wasn't really swinging freely and she was," said Osaka. "I just feel tight playing here a little bit because of the defending thing.

"And then today more because I have played her before. There's always such a huge hype leading into the match. And of course it's well-deserved. It's just tough.

"You don't want to lose to a 15-year-old. But I guess that's for me a reality check. It doesn't really matter the age of the opponent."

Osaka remains a frustratingly inconsistent player and she likened a tennis career to a series of tests.

"I feel like there are moments where I can handle them," said the 22-year-old. "Then there are moments like this where I get overwhelmed and I don't really know what to do in the situation.

"It was one of those days where I couldn't do anything right, it felt like. I don't really have the champion mentality yet, which is someone that can deal with not playing 100 per cent. And I have always wanted to be like that, but I guess I still have a long way to go."

PA