Stanislas Wawrinka will "never forget" Tomas Berdych triumph

World number 10 Stanislas Wawrinka has revealed his joy after advancing to the quarter-finals of the US Open.

The Swiss came out on top in a high-quality fourth-round tie after beating Tomas Berdych 3-6 6-1 7-6 6-2 on Tuesday at Flushing Meadows.

Wawrinka, who will face Andy Murray in the last eight, is delighted to have overcome a tough clash.

"It's always tough to play against Tomas," Wawrinka told reporters. "He always puts you under pressure.

"I'm just really, really happy. Tonight is a night I will never forget."

Wawrinka broke Berdych's serve six times in a match that included 68 winners.