Daniil Medvedev warned a player could die in the 90-degree heat at the US Open.
Medvedev needed medical attention and an inhaler as he struggled in the hot and humid conditions before beating his fellow Russian Andrey Rublev.
The roof on Arthur Ashe Stadium was partially closed to protect the players from the sunlight, but both were visibly wilting during the two hour 48-minute battle.
Late in the third set, when Medvedev went to his towel, he said into a television camera: “One player is gonna die and they’re gonna see.”
Following his 6-4 6-3 6-4 quarter-final victory, the 2021 champion recalled an incident earlier this summer when Chinese player Wu Yibing collapsed during a match in Washington.
He said: “I could talk a lot, brutal conditions for both of us.
“I mean, I don’t know if it could be seen through the camera, because we are sweating so much and use a lot of towels.
“I have no skin left on my nose here, and, like, here it’s red, but it’s not because of the sun so it’s not like you’re burned but I have no skin left.”
He continued: “I just saw Andrey in the locker room and his face is very red, and it’s also not because of the sun so I guess it’s the same. That tells everything, like we left everything out there.
“The thing is that even if it would go further, I think we would still leave even more. Then I don’t think I had anything left but if the match would go on, I would find something more.
“And the only thing that is a little bit, let’s call it dangerous, is the question how far could we go? Maybe we could go five sets and it would be… when I say ‘fine’, yeah, we would struggle a little bit next day and it would be fine, or we have a person in Wu who fell down.”
Medvedev said he felt shaky as he tried to recover from the match.
“I’m feeling kind of okay now. I’m just pretty exhausted. Let’s say, yeah, do couple of interviews here and there straightaway, and it was tough.
“I was with an ice towel there. Everything was foggy, like I couldn’t see clearly. Because the match is over, so the adrenaline is not there anymore.
“So I was, like, a little bit shaky. Then I come to the locker room and that’s the toughest part because you kind of want to just sit there for hours. But you know that if you do it, it’s not a good recovery.”
He continued: “So I sat there for, like, 10, 15 minutes, went and did a quick ice bath. Changed. Went to eat. But had, I don’t know how you call it in English, when sugar blood, sugar levels go up. I started sweating, my head started turning.
“I said to my team please bring me any food. I was sitting there like this sweating like hell even with the AC on, and they brought some food and then I felt better. Yeah, that’s how it is sometimes.”
Rublev, who has now lost nine out of nine quarter-final matches at grand slams, said: “I’m not even thinking about my health.
“I don’t know. At this moment, these moments I’m thinking that I need to fight. Doesn’t matter how, it’s tough.
“I mean, the sport is not easy. And you need to be ready for everything that can happen.”
Djokovic keeps Serbia on track as Ruud seals Norway win
Novak Djokovic marked his return to action with a dominant 6-0 6-1 victory over Greece's Ioannis Xilas to put Serbia in control of the Davis Cup tie.
The 24-time major winner was playing his first match since his US Open third-round defeat by Alexei Popyrin at Flushing Meadows a fortnight ago.
And Djokovic, who helped his nation win the Davis Cup in 2010, looked close to his best as he dropped just a single game, while converting five of the seven break points he forced.
Wrapping up a dominant victory in just 45 minutes, he put Serbia 2-0 to the good in the World Group I tie.
Elsewhere in that group, Casper Ruud helped Norway wrap up a 3-1 win over Portugal.
The three-time major finalist, who put his nation 2-1 to the good alongside Viktor Durasovic in the doubles rubber, was a 7-6 (7-3) 6-2 victor over Jaime Faria in their singles clash.
Later in the day, Argentina booked their place in the final eight after Maximo Gonzalez and Andres Molteni saw off Finland in the doubles decider.
Nadal unsure of future involvements after Laver Cup withdrawal
Rafael Nadal says he cannot commit himself to future tournaments after his withdrawal from the Laver Cup.
Nadal shared news on Thursday that he would not make an appearance at the annual event in Berlin, stating that it would not be in the best interests of Team Europe if he were to participate.
The Spaniard was last in action playing doubles at the Paris Olympics with Carlos Alcaraz, and while he says he is in a good space mentally, he was not able to confirm when he would next make a professional appearance on a tennis court.
He said: "Mentally, I’m good, no problems. I'm at home enjoying other things, training as much as I can every day.
"No drama, obviously these are decisions [the Laver Cup withdrawal] that are being made, and this was a possibility - it's been a while without competing. There will be someone else who can do better.
"Right now I’m not in a position to put myself down for anything.
"I said [I would play] until the Olympics and then we would see, and I'm in that period of rest."
Nadal has endured a difficult 2024 so far, playing just 21 competitive singles matches with a record of 13-8.
He has only one grand slam victory to his name this year, beating Jack Draper in the Australian Open, but he lost in the first round of the French Open to eventual finalist Alexander Zverev.
Alcaraz sends Spain into Davis Cup last eight
Carlos Alcaraz has led Spain to the quarter-finals of the Davis Cup Finals after a straight-sets win over Ugo Humbert.
The 21-year-old needed just one hour and 21 minutes to cruise through with a 6-3 6-3 victory, hitting 21 winners to his opponent's 14 as he backed up Roberto Bautista's win earlier on.
Bautista had to come from behind to edge past Arthur Fils, beating him 2-6 7-5 6-3, and converting 40% of his break points, bettering the Frenchman's 27%.
Spain are through in Group B, but elsewhere in Group D, US Open semi-finalist Jack Draper's return was unable to inspire Great Britain to victory.
Dan Evans was beaten by Tomas Martin Etcheverry earlier on Friday before Draper's first match since New York ended in a straight-sets 7-6 (7-4) 7-5 defeat to Francisco Cerundolo.
Despite making fewer unforced errors than the Argentinian (23 to 39), the British number one struggled to find an edge, though Evans and Neal Skupski claimed a consolation win in the doubles to make it 2-1.
They sit second in the group, missing the chance to qualify for the last eight, and now needing a win against Canada, who have been in fine form so far.
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