- Marin Cilic toppled sixth-seeded Czech Tomas Berdych 6-2, 6-4, 7-6 (7/4) on Thursday to reach the US Open semi-finals.
The 14th seed becomes the first Croatian since Goran Ivanisevic in 1996 to reach the final four at Flushing Meadows, and he pulled off the upset under the watchful eye of Ivanisevic, now his coach.
Cilic, who missed last year's US Open as he sat out a doping ban, pounded 19 aces past Berdych, recovering an early break in the third to force the decider.
He'll face either five-time champion Roger Federer or 20th-seeded Gael Monfils of France for a place in the championship match.
"It was a truly amazing day for me in very difficult conditions, very gusty," Cilic said. "I think I adjusted better than Tomas today."
Cilic has matched his best Grand Slam performance -- a semi-final run at Australia in 2010.