Andy Murray's US Open title defence ended tamely as Swiss ninth seed Stanislas Wawrinka outplayed him in the quarter-finals in New York.
The Briton, seeded third, failed to earn a single break point in a 6-4 6-3 6-2 defeat in the Arthur Ashe Stadium.
Murray has struggled to find his best form since winning Wimbledon two months ago, and his frustration was clear when he was given a code violation for racquet abuse.
"It was a tough day for me," Murray told BBC Radio 5 live.
'He played too well'
"He played exceptional tennis and served very, very well. He hit a lot of lines on big points, went for his shots and they all went in today. He played too well."
In a match many had predicted would go to five sets, it took only two hours and 15 minutes for Wawrinka to win on a hot and blustery afternoon in New York.
The conditions caused both players problems in the early stages, with Murray netting a straightforward volley before Wawrinka played an air shot on his usually brilliant backhand.
Murray, 26, won his first major title at last year's US Open.