Temperatures rise, seeds fall at Australian Open

Australian Open Maria Sharapova into the second round after defeating Tatjana Maria

Maria Sharapova celebrates after winning her opening match at the Australian Open

"It is more helpful to play now than in the day".

Any player hoping to stop him retaining his title and claiming a 20th grand slam will have to be pretty special on this evidence.

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As I said, it's nothing major to be concerned about.

"It's definitely a challenge". But you know when you come down here that can happen.

"He's won three matches here, playing at very high level".

"I'm looking forward to playing against her", the German said. "Used to go to Dubai when it was 45 - 38 seems nearly OK".

Relief was at hand, however, with a cool change blowing over the city and the temperature expected to fall back below 30 by the evening.

American Tennys Sandgren, who had never won a Grand Slam match before this year's Australian Open, also progressed.

That left only Maria Sharapova, Aneglique Kerber and French Open champion Jelena Ostapenko as Grand Slam winners in the women's draw.

Make that an exhausted deep breath, because the Romanian must now contest the rest of the Open with the physical baggage of an epic two-hour, 22-minute deciding set against American Lauren Davis.

Novak Djokovic revealed he was "right at the limit" of his physical and mental endurance in "brutal" Melbourne temperatures following a win over Gael Monfils, who said he was "dying on court for 40 minutes".

Also advancing were No. 6 Karolina Pliskova, No. 8 Caroline Garcia, No. 26 Agnieszka Radwanska, No. 28 Ash Barty and No. 29 Lucie Safarova. Nor did Wimbledon champion and No. 3 Garbine Muguruza.

No. 123-ranked Pera is making her Grand Slam debut and, after losing in the last round of qualifying, didnt even know she had a spot in the main draw until Margarita Gasparyan withdrew. "If the courts have roofs, why not put the roof on when the conditions are extreme?"

"I got super dizzy".

I deal with it.

Sharapova only returned to the top 50 two weeks ago and Kerber to the top 20 last week after being on top of the rankings as defending champion in Melbourne a year ago.

The heat peaked during Djokovic's win.

Federer had already beaten Aljaz Bedene and Jan Lennard-Struff without dropping a set and was again in imperious form against an opponent he has now beaten 17 times and not lost to since 2011.

After beating Monfils in a sloppy, four-set slug-fest, Djokovic said tournament supervisors should have delayed the match.

“It was obvious we both suffered on the court today, ” Djokovic said.

"I had a really tough off-season and I was working hard to be here and playing against the best players".

Dimitrov played in the afternoon sun and got the better of Andrey Rublev 6-3 4-6 6-4 6-4, gaining some revenge after the young, big-hitting Russian won their encounter at the US Open.

It was last enforced in 2014 when play was suspended after Melbourne had three consecutive days with temperatures above 40C.

Kerber now looms as a serious title threat, having seemingly overcome the form struggles that plagued her past year. "I understand there is a factor of tickets". I like to, sometimes, play in heat.

But he said the conditions were at the point where it becomes a "danger in terms of health".

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