World No. 4 Andy Murray reached the quarterfinals of the U.S. Open Thursday with a 6-2, 6-3, 6-3 victory over U.S. wild card Donald Young.

Avenging his loss to the 84th-ranked Young at Indian Wells in March, Murray reached the last eight at Flushing Meadows for the first time since he fell in the 2008 final to Roger Federer.

They played just 15 minutes Wednesday, with Young holding a 2-1 lead when rain again brought the proceedings to a halt.

The 22-year-old American's bid to become the first wild card to reach the quarters since James Blake in 2005 was doomed by 53 unforced errors.

Meanwhile, defending champion Rafael Nadal beat Gilles Muller of Luxembourg to reach the quarterfinals with a 7-6(1), 6-1, 6-2 win.

The second seed had trailed 0-3 overnight after just 15 minutes of play had been possible Wednesday.

Nadal had led a player revolt, angry at having to go on court when the Arthur Ashe Stadium surface was still damp and with rain still in the air. He had claimed players' safety was being compromised by tournament officials desperate to clear the backlog caused by the downpours.

He has endured a dramatic Open, collapsing with cramps at a news conference after his third round win over David Nalbandian.