Juan Martin del Potro shrugged off sickness to save two match points and defeat Dominic Thiem in a five-set US Open epic on Monday to book a quarter-final showdown with five-time champion Roger Federer. Argentina 24th seed Del Potro claimed a heroic 1-6, 2-6, 6-1, 7-6 (7/1), 6-4 victory over the sixth-seeded Austrian on a rocking Grandstand court, describing it as night he would remember forever.
Del Potro famously defeated Federer in the 2009 final for his only career Grand Slam title before his career was almost torpedoed by a succession of wrist surgeries. Federer, the third seed, eased into the last-eight with a 6-4, 6-2, 7-5 win over Philipp Kohlschreiber, taking his record over the German veteran to 12-0.
"Oh my God," said Del Potro, who had been 2-5 down in the fourth set. "I was sick the last two days. I came here trying to play the best I can and then when I see this crowd cheering for me, I was trying to play better every game. I will always remember this."
Federer has a 16-5 advantage over Del Potro but they have split their last six meetings. The 36-year-old Swiss maestro didn't face a break point against Kohlschreiber with his biggest challenge having to take a medical time-out off court at the end of the second set.