Rafael Nadal kept his US Open title defence on track with a 6-2 6-1 6-3 demolition of Andy Roddick to set up a semi-final against Andy Murray.
The world number two raced to a 4-0 lead in the first set and never looked back, breaking three times in the second and once in the third.
Roddick was treated for a leg injury but looked lost for ideas as Nadal beat him in an hour and 53 minutes.
The Spaniard goes on to play Murray after the Briton .
While Roddick appeared to be struggling physically in the latter stages, it was a highly impressive display from Nadal.
The 10-time Grand Slam champion hit 35 winners, including 22 off his fearsome forehand side, and he remains the only men's player yet to lose a set in the tournament.
"The beginning was really important," said Nadal. "Andy had a really tough match yesterday [against David Ferrer] so he was probably tired.
"I'm sorry for him - he has had a fantastic career and it a great champion."
Looking ahead to his meeting with Murray, Nadal added: "It's always a pleasure to play Andy, he's one of the players with the most talent on the tour.
"It's always exciting against him and a big challenge for me. I lost to him in the 2008 semi-finals and I will have to play aggressive, play my best tennis.
"If I play like I did today then I'll give myself a good chance."