Kim Clijsters beat Anastasia Myskina to reach the Australian Open semi-finals, despite struggling with an ankle injury.
The Belgian looked close to retiring when she called for the trainer at 4-1 down in the second set.
But she staged a remarkable recovery to come through 6-2 7-6 in a dramatic tie-break.
Clijsters goes on to face Patty Schnyder in the semi-finals after the Swiss beat Lisa Raymond.
"I started off really well, was feeling good - I wish I ended like that," said Clijsters.
"I had a little stumble in the second, then I got taped very tight, which kept me from making it any worse.
"I was very happy I could pull it off in two sets, otherwise it would have been hard."
The world number two looked in superb form early on as she raced 5-0 clear in just 13 minutes, but was soon in trouble in the second set.
Russian sixth seed Myskina moved 4-0 ahead as Clijsters struggled and when the Belgian needed a lengthy injury time-out to have her ankle re-strapped, a retirement looked possible.
However, Myskina failed to capitalise as a first Grand Slam semi-final loomed and Clijsters had two match points on the Myskina serve at 6-5.
A tense tie-break followed in which Myskina had two set points and Clijsters missed three more match points before finally wrapping up the match.
"I was nervous -- I think I lost this match before I even played it," admitted Myskina.
"I was just trying to keep the ball in but Clijsters was winning those rallies."
Clijsters now faces a nervous 24 hours to see if there is any
adverse reaction to the injury.
"I'll have to see how it reacts tomorrow," said the Belgian.
"I will try to ice it as much as I can today and maybe take some painkillers and anti-flammatories tomorrow to try and keep the swelling down."
"I have a week off after this so I might as well go for it and give myself a shot."