Following two days of rain-outs, up Andy Murray recorded fourth-round victories at the USTA Billie Jean King National Tennis Center.

Rain wiped out all of the scheduled action here on Tuesday, and only about 15 minutes of tennis was staged on Wednesday because of inclement weather in New York.

A second-seeded Nadal handled fellow left-hander Gilles Muller of Luxembourg 7-6 (7-1), 6-1, 6-2 at Arthur Ashe Stadium. The match was postponed on Tuesday and halted because of rain on Wednesday, with Muller leading 3-0 in the opening set.

Nadal moved on in 2 hours, 8 minutes, as Muller piled up 43 unforced errors and had his big serve broken six times.

The capable Muller stunned Nadal in a second-round affair at Wimbledon back in 2005. Nadal avenged that defeat by besting Muller in the third round at Wimbledon 2011 earlier this summer.

The 10-time major champion Nadal is the reigning U.S. and French Open titlist. He beat Serbian star Novak Djokovic in last year's finale here in Flushing.

The fourth-seeded Murray, meanwhile, flattened 22-year-old American Donald Young 6-2, 6-3, 6-3. The match was suspended on Wednesday, with Young leading 2-1 in the first set. But the American was no match for the Brit on Day 11.

Murray, who closed out his Thursday exercise with a resounding ace, ultimately dismissed the overmatched Young in just under two hours, as the American littered the court with 53 unforced errors and had his serve broken a whopping eight times.

Young stunned Murray in the second round at an ATP Masters event at Indian Wells back in March.

The three-time Grand Slam runner-up Murray was this year's Aussie Open runner- up to Djokovic and lost to the great Roger Federer in the 2008 U.S. Open finale.