British number one Jo Konta recovered from heat stroke to secure her progress in sweltering temperatures at the US Open in New York.
Konta, the world number 14, took the first set off Bulgarian rival Tsvetana Pironkova in double quick time, which was just as well with the mercury bubbling at over 30 degrees and humidity at 80%.
But she suddenly started to struggle and was looking to save a third set point when she worryingly collapsed, complaining of a racing heart, blurred vision and feeling numb.
She was treated for nearly 15 minutes by medical staff before returning to the court and serving a double fault, which allowed Pironkova to level the scores.
But, after a further medical delay, she reasserted her control of the match, breaking Pironkova at the first opportunity and then sealing her progress 6-2, 5-7, 6-2, setting up a third round encounter with Switzerland’s Belinda Bencic.
Kyle Edmund had no such dramas as he made the third round of a Grand Slam tournament for the first time with a straight sets win over American wild card Ernesto Escobedo.
The 21-year old continued where he left off with his career best win over 13th seed Richard Gasquet, hitting a succession of booming forehand winners to progress 7-5, 6-4, 6-4.
And he insists they’ll be no fear as he takes on big-serving home favourite John Isner for a place in the fourth round.
“I’m just happy to have won, I did a lot of things right and it was a very clean match,” said Edmund, who has already hit over 100 winners in the tournament and has yet to drop a set.
“This was about toughing out some long rallies and while there were a few more errors I’m not being hard on myself.
“He’s the type of player that can hit good form at any point and finds winners from anywhere but I stayed tough in every set.
“You’ve got to be physically strong in this sport and I’m investing lots of time in that, you don’t see top players in this sport who aren’t physically at their very best, especially in these conditions.
“Straight sets makes a big difference but I still had to dig deep and I was fighting until the last point. I didn’t want to be out on court maybe 45 minutes longer, so it was nice to get it wrapped up.”
Sportsbeat 2016