Third seed Juan Martin del Potro on Sunday set up a quarter-final clash at the US Open with American John Isner after a humbling defeat of Croatia’s Borna Coric 6-4, 6-3 6-1.
The Argentine sent down nine aces and 33 winners to seal a one-sided victory over the 20th seed in just over two hours, with Coric making 30 unforced errors to undermine his own cause.
The Croatian needed a medical timeout in the second set, and was then blown away by Del Potro’s booming forehand in the third, surrendering the set in just 30 minutes.
Del Potro, champion in 2009, got an early break to go 3-1 up in the first, before Coric fought back to level at 4-4, converting the only break point he carved out in the match.
The opener looked to be heading for a tiebreak before Del Potro dispatched a backhand volley to earn himself two more break points in the 10th game.
Coric rallied for deuce but double-faulted to give Del Potro another break point opportunity and conceded the set with an unforced error.
“I think that moment was the key of the match,” Del Potro said in an on-court interview,adding “it gave me confidence.”