Marat Safin reached the fourth round of the Australian Open after an epic encounter with veteran American Todd Martin.
Safin almost gave into frustration midway through the match
Safin looked ready to concede defeat after dropping the third set but he suddenly rediscovered his form against a tiring opponent.
The Russian powered a backhand past Martin to secure a 7-5 1-6 4-6 6-0 7-5 win after more than three hours on court.
The former finalist will face James Blake for a place in the last eight.
Blake, who beat Safin at the Hopman Cup in Perth earlier this month, overcame qualifier Olivier Patience in straight sets.
Safin, who was warned by the umpire for equipment abuse, admitted he had been frustrated by Martin's high-quality serving.
"I couldn't find a way to break him, I was looking for so many ways I got a bit upset," he said.
However, the Russian said he was happy to have survived such a gruelling encounter after spending much of last year on the sidelines.
"This was a good win, pretty impressive actually," he said.
"It is hard to come back, hard on the body. A long match like this will be good, it helps you get the movement back. I am not tired."