The Latest: Dimitrov through to 4th round at Australian Open
MELBOURNE, Australia (AP) The Latest on Friday at the Australian Open (all times local):
Third-seeded Grigor Dimitrov has advanced to the fourth round at Melbourne Park, beating Andrey Rublev 6-3, 4-6, 6-4, 6-4 in a Rod Laver Arena match which concluded the day session on the main show court.
After beating qualifiers in his first two matches, Dimitrov had a much more difficult time against the 30th-seeded Rublev. Serving for the match, Dimitrov faced a break point before advancing on his first match point, clinching it with a winner off a Rublev drop shot.
Dimitrov will next play the winner of Friday night's match on Rod Laver between local hope Nick Kyrgios and 2008 finalist Jo-Wilfried Tsonga in the round of 16.
Coco Vandeweghe has been hit with the largest fine of the 2018 Australian Open so far - a $10,000 penalty for unsporting conduct for screaming an obscenity at her first-round opponent, Timea Babos.
Vandeweghe said after the match that she was irritated by what she described as excessive celebrating by her Hungarian opponent during their match.
The 10th-seeded Vandeweghe was assessed a code violation for the obscenity and delay of game for insisting on eating a banana during a changeover, getting docked a point in the second set of her 7-6 (4), 6-2 loss.
Borna Coric has received the largest fine thus far in the men's draw - $5,000 for shattering his racket during his first-round loss to John Millman.
The worst of the extremely hot temperatures appears to be over at Melbourne Park.
The forecast high of 42 Celsius (108 Fahrenheit) was never quite reached, with the temperature hitting 40.3 C (104.5 F) before a weather change came through that cooled things off, somewhat.
Within an hour, the temperature had starting dropping. At 3 p.m. it was 35.6 C (96 F).
Alize Cornet took a medical timeout and had her pulse and blood pressure checked during her match with Elise Mertens when the French player complained of shortness of breath.
But after being iced down by a trainer, she continued her match.
Elina Svitolina has ended 15-year-old Marta Kostyuk's strong run at Melbourne Park.
The fourth-seeded Svitolina beat her fellow Ukrainian 6-2, 6-2 on Rod Laver Arena to advance to the fourth round.
Kostyuk, who had nine double faults Friday, including on match point, received entry into qualifying because of her junior girls' victory last year at the Australian Open. She won all three qualifying matches, then her first two in the main draw.
Her win over Peng Shuai in the first round made her the youngest player to win a main-draw match at the Australian Open since Martina Hingis in 1996.
Kostyuk entered the tournament ranked No. 521. A Women's Tennis Association official said Friday her ranking should improve to around 250 because of her performance at Melbourne Park.
Petra Martic celebrated her 27th birthday with a 6-3, 3-6, 7-5 win over Luksika Kumkhum to advance to the fourth round at Melbourne Park.
The Croatian player will take on Elise Mertens or Alize Cornet in the final 16. Luksika had beaten Belinda Bencic in the second round after Bencic defeated Venus Williams in the first.
On Thursday, 2016 champion Angelique Kerber celebrated her 30th birthday with a second-round win over Donna Vekic.
Qualifier Denisa Allertova became the first player to advance to the fourth round of the Australian Open after defeating Magda Linette 6-1, 6-4 at Margaret Court Arena.
Allertova will next play either fourth-seeded Elina Svitolina or 15-year-old Marta Kostyuk.
By 1 p.m., temperatures had risen to 39 Celsius (102 Fahrenheit) , three degrees higher than at the start of play two hours earlier , but still under the forecast high of 42 C (108 F).
Melbourne Park was expected to be scorching on Friday, with temperatures reaching 42 Celsius (108 Fahrenheit) for the fifth day of the Australian Open.
While top-seeded Rafael Nadal, Nick Kyrgios and Caroline Wozniacki were among those scheduled to play their third-round matches, tournament officials were expected to keep a close eye on the rising temperatures. When play began at 11 a.m., it was already 35 C (95 F).
On Thursday, officials were criticized when play continued after the temperature reached 40 C (104 F), and several players, including Gael Monfils, complained it should have been stopped.
The tournament has an Extreme Heat Policy which goes into effect when the air temperature exceeds 40 Celsius and the wet-bulb reading, which takes into account other factors such as humidity, is more than 32.5 C (91 F).
When both those temperatures are exceeded, matches on outside courts are supposed to be suspended and the roofs closed on all three main stadiums - Rod Laver Arena, Margaret Court Arena and Hisense Arena.
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Updated January 19, 2018