A US OPEN tennis fan collapsed as temperatures hit a staggering 100 Fahrenheit in New York.
That prompted one of last night's quarter-final clash to be suspended before Madison Keys' classy gesture.
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With stifling heat at Flushing Meadows, a supporter passed out early on in the showdown between 2017 runner-up Keys and Marketa Vondrousova on Arthur Ashe Stadium.
The male fan, dressed in a white T-shirt, needed medical assistance.
And as fellow spectators called for help, Keys jumped into action.
The No17 seed American - who was serving in the very first game of the match at the time of the emergency - immediately ran over to her chair.
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She collected water and towels, handing them over to US Open staff who took them to the spectator.
The man was then helped out of the gigantic tennis arena to receive more support away from the public glare.
In total, the match was stopped for eight minutes as the players took their seats amid the intense heat and sweltering humidity.
Viewers watching the US Open last-eight clash praised Keys for her quick thinking.
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One said: "I loved Madison Keys before, but seeing her stop play to bring bottled water and towels to a fan who collapsed, likely because of the heat, I have a whole new level of respect for her."
Another wrote: "I hope that fan at the US Open is okay! This heat is no joke right now."
And a third added: "It feels like a sauna outside."
Keys, 28 and from Illinois, raced to a 6-1 6-4 victory to set up a semi-final showdown with Australian Open champion and incoming world No1 Aryna Sabalenka.
Players, fans and media have struggled to cope with the weather conditions over recent days.
Karolina Muchova caused a stir by going off court for a full outfit change - despite winning the first set against Sorana Cirstea 6-0.
The Czech ace faces Coco Gauff in the other women's singles semi.
Daniil Medvedev, meanwhile, claimed a tennis player will "die" before officials do something about the extreme heat.
Medvedev beat close pal Andrey Rublev to book his place in the semi-finals where he will face Carlos Alcaraz.
US Open chiefs have played some daytime matches under the roof to provide some shade and ensure players are not in direct sunlight.
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But the Russian No3 seed - who used an inhaler in earlier rounds - was still struggling to breathe and covered himself in cold water in an attempt to cool down.
And he blasted: "You cannot imagine, one player is going to die and then they're going to see."
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