Coco Gauff showed all of her battling qualities as she fought through a back injury to beat Marta Kostyuk and keep her WTA Finals last-four hopes alive.
American Gauff was visibly in pain as she received treatment on her lower back midway through a match she needed to win to stay in the tournament.
She found herself 5-1 down in the second set - only to win six games in a row to complete a 6-4 7-5 win at Indian Wells.
"Physically, I wasn't at my best, which I'm not really used to," Gauff told Sky Sports.
"It was like a mental challenge, learning how to play through that."
The long tennis season has taken a toll on a number of players, with Ukraine's Kostyuk also receiving treatment on a wrist injury that has been hampering her since August.
It is the second time that Gauff has overturned a 5-1 deficit at this tournament, having done the same to beat Jessica Pegula on Sunday.
However, the 22-year-old admitted she was not expecting it to happen again, and was already preparing herself for a third set.
"I asked my physio at 5-2 down, what can I do on the bathroom break [between sets] to try and loosen up," Gauff said.
