Del Potro pulled off a surprising upset to defeat Federer. Del Potro entered the match as the decided underdog, with a 17% chance to win before the match started.
From the outset, Del Potro refused to go away, chipping away at Federer's lead until Del Potro took their first lead toward the end of the match. Federer never recovered after losing the lead, and by the time the match ended, Del Potro had earned the upset.