World number seven Jelena Ostapenko was beaten by Estonia’s Anett Kontaveit in the third round of the Australian Open.

The French Open champion suffered a 6-3 1-6 6-3 defeat by world number 33 Kontaveit in one hour and 53 minutes.

Kontaveit, who has reached the fourth round for the first time in Melbourne, will next play Spain’s world number 39 Carla Suarez Navarro.

Elsewhere, second seed Caroline Wozniacki reached the last 16 with a straightforward win over Kiki Bertens.

Wozniacki beat her Dutch opponent 6-4 6-3, saving four break points in the final game before serving out the match.

The Dane will next face Slovakia’s Magdalena Rybarikova.

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Ostapenko’s exit means that Angelique Kerber and Maria Sharapova – who play each other on Saturday – are the only two Grand Slam champions remaining in the women’s draw.

There were 11 double faults in a scrappy affair on Margaret Court Arena, with Latvia’s Ostapenko losing all five of her service games in the first set.

Ostapenko took a medical timeout before the second set for treatment on her thigh and she found enough rhythm to take the game into a third set.

Despite some solid defence from Ostapenko, Kontaveit got the decisive break before winning eight of the final 10 points of the match to claim victory.

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Nick Kyrgios kept home hopes very much alive in the men’s singles at the Australian Open with victory over France’s Jo-Wilfried Tsonga.

The 22-year-old 17th seed beat 15th seed Tsonga 7-6 (7-5) 4-6 7-6 (8-6) 7-6 (7-5) in the third round.

Kyrgios goes on to face Bulgarian third seed Grigor Dimitrov in the last 16.

On a day when temperatures peaked in the afternoon at 40.2C, Kyrgios benefited from playing in the cooler night session.

Tsonga, 32, was one of the Australian’s childhood heroes and a finalist in Melbourne 10 years ago.

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The Frenchman gave a serious examination of the man most likely to end Australia’s 32-year wait for a male champion, but Kyrgios held his nerve impressively in three tie-breaks.

“He is a great guy, a champion of the game, someone I looked up to as a kid,” said Kyrgios of his opponent afterwards.

“To be in the locker room with these guys, the first year especially, was surreal.

“Grigor Dimitrov is an amazing athlete who finished the year strongly last year, and the best-of-five sets might suit him. It will be a tough match.”

The margins were slim between two of the game’s bigger servers – both men finished with 28 aces – a Tsonga double-fault handing over the first set, before a delicate drop shot earned him the only break of the second.

Both had their chances in the crucial third set tie-break but it was Kyrgios who took his first opportunity with a backhand return.

Break points went begging early in the fourth, with Kyrgios finding a superb second serve under pressure at 30-30, 4-5, before Tsonga looked to be forcing a fifth set when he led 5-2 in the third tie-break.

A knee issue then looked to disrupt him and Kyrgios took full advantage, reeling off five points in a row to seal victory.

Tsonga was asked after the match about an altercation he had with a spectator in the third set, which prompted a furious response from the Frenchman.

“The guy was talking to me and telling me, ‘You are under pressure now, you are under pressure now,’ when I was bouncing my balls,” he said.

“That’s it. I lost it and I drive a little bit crazy. You know, it’s not fair. It’s not fair. But that’s it.

“The guy was feeling safe because he was upstairs. I just tell him, ‘Come now to see if you feel the pressure or not.’ That’s it.”

‘The heat didn’t scare me’

Dimitrov earlier came through a tough match against 30th seed Andrey Rublev in the heat of the afternoon.

The Bulgarian needed over three hours to win 6-3 4-6 6-4 6-4 on Rod Laver Arena.

“These are most important matches when things are not working and I am able to find a way,” Dimitrov, 26, said.

“Physically I am feeling good and the heat didn’t scare me. That is a good sign.”

Asked about the prospect of facing Kyrgios, and the majority of the crowd, Dimitrov said: “I’ve done it many times before.

“I’ve played against the local, so to speak. That’s part of the game.”

World number one Rafael Nadal continued his straightforward progress through the Australian Open with a 6-1 6-3 6-1 win over Bosnia’s Damir Dzumhur.

The 31-year-old, who has won only one of his 16 Grand Slam titles in Australia, wrapped up his third-round victory in an hour and 50 minutes.

The Spaniard is yet to drop a set so far in the tournament and will face Argentine Diego Schwartzman next.

Nadal has won all three of his previous matches against the world number 26.

The Spaniard is seeded to meet Marin Cilic in the quarter-finals before a last-four meeting with Grigor Dimitrov and a final against Roger Federer.

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Dzumhur never looked like derailing those plans, slipping 5-0 down in the opening set and offering up a total of 16 break points in the face of constant Nadal pressure.

Ukrainian fourth seed Elina Svitolina outclassed 15-year-old compatriot Marta Kostyuk to reach the Australian Open fourth round.

Svitolina, 23, won 6-2 6-2 in 59 minutes against world number 521 Kostyuk.

The youngest player since 1997 to reach the third round of a Grand Slam, Kostyuk was aiming to be the youngest since 1996 to progress to the last 16.

Svitolina will play world number 130 Denisa Allertova in round four.

“It was sad that I was playing a Ukrainian girl,” said Svitolina. “It’s always difficult playing someone from your own country, but I’m happy that I’m still alive in this tournament.

“She’s a great fighter, she fought right until the end and has a great future.”

The Ukrainian pair’s match was played in 40C heat on Rod Laver Arena while France’s Alize Cornet had her blood pressure taken by a doctor during her defeat by Elise Mertens on the Hisense Arena.

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Roger Federer has called for the Grand Slams to up their levels of prize money and said players are “bored’ of having to push the issue.

The subject has been raised at the Australian Open after Novak Djokovic reportedly initiated a players-only meeting on the eve of the tournament.

Federer, 36, is a former president of the ATP player council, the same position Djokovic now holds.

“They could definitely pay more, no doubt about it,” Federer said.

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In 2012 there was talk of a player boycott if the major tournaments did not take action to increase prize money.

That was followed by pay increases, particularly for players losing in the early rounds.

“We’re not partners. We’re just players. It’s always hard to rally,” said Federer, a 19-time Grand Slam winner.

“We had a good agreement, in my opinion, that made the Grand Slams happy, the players pretty happy. It seems like that has run its course.

“The moment that happens, there’s not the same increases any more, so players have to rally, get back together again, put in the effort. The Grand Slams know that. They will only react when we do so. We’re ready to do it. It’s going to be the same process over and over again.

“It’s a bit boring, to be honest, always having to ask for stuff. If you look at the revenue, the sharing process, it’s not quite where it’s supposed to be.

“But you can’t go from here to right there in a day. We know that. We just hope they realise and they do appreciate us maybe more all the time and not just in waves.

“We have good contacts with the slams. It’s all good. But it’s going to be a never-ending story.”

It has been reported that Djokovic raised the prospect of forming a players’ union separate from the ATP.