Defending champion Rafael Nadal overwhelmed Andy Roddick 6-2, 6-1, 6-3 on Friday to reach the U.S. Open semifinals for the fourth consecutive year.

The second-seeded Nadal dominated 2003 title-winner Roddick for stretches, racing to a 4-0 lead thanks to two service breaks in the opening 18 minutes, then taking 16 of the last 17 points in the second set.

The 21st-seeded Roddick had both legs massaged by a trainer in the third set.

Seeking his 11th Grand Slam title, Nadal hasn't dropped a set in the tournament.

In Saturday's semifinals, he'll face No. 4 Andy Murray, who beat No. 28 John Isner earlier Friday.

Nadal owns a 12-4 lead against Murray, including victories in the semifinals at the French Open and Wimbledon this year.