Andy Murray admitted the way he tired towards the end of his US Open quarter-final defeat to Novak Djokovic was the most disappointing aspect of his exit.
The 27-year-old got off to a fine start in his final-eight clash as he won the second set 6-7 to level the game against world number one Djokovic, having lost the opener.
However that was as good as it got for Murray as he went on to lose the next two sets 6-2 6-4 as his demise came in three hours and 32 minutes at Flushing Meadows.
Murray carried out a training block with his support team in Florida after a disappointing quarter-final defeat at Wimbledon in July but the Scot was disappointed that Djokovic proved physically stronger in their match.
"I thought physically he was better than me in the end," said Murray, the eighth seed.
"I was a little bit disappointed, to be honest, because I did train very hard.
"You do the work for these matches, so I would have liked to have felt a little bit better towards the end.
"Maybe I haven't played enough matches at that level this year.
"It's obviously different playing at that level, playing against the number one in the world. And the way that we play against each other, it's just an extremely physical match.”
© Sportsbeat 2014