Murray wants answers after exit
Andy Murray will aim to find the answer to why he struggled to cope physically in his US Open defeat to Stanislas Wawrinka on Sunday night as another tilt at a first Grand Slam title ended in disappointment.
Murray took the opening set in a tie-break but Wawrinka hit back to complete a 6-7 (3/7) 7-6 (7/4) 6-3 6-3 victory in three hours and 56 minutes.
The match featured 13 breaks of serve and almost as many breaks in play for medical treatment to both players before Wawrinka sealed a fourth-round clash with American Sam Querrey.
Murray initially put any physical issues down to "just part and parcel" of playing a long match, but added: "Whether it was fatigue or not I don't know.
"I haven't been really tired in any long matches for a long, long time. In the third and fourth sets I was struggling physically and I got frustrated with that. I haven't been in that position for a very long time.
"I felt like my chance of doing well here was slipping away. I've worked very hard to give myself a chance of winning tournaments. When I was struggling physically, I got disappointed."
Murray did have stamina issues early in his career, but took determined action to rectify the problem, hiring a fitness team and undertaking strenuous fitness programmes in Florida at least twice a year.
The 23-year-old Scot added: "I still feel like I'm super fit, I just didn't feel great (today). There were a lot of things that I was feeling on the court. But, yeah, I just haven't felt that way for a few years now.
"I'm going to have to go look at why that was the case and try and get better."
Murray graciously did give credit to his friend and occasional practice partner Wawrinka, however, adding: "He played better than me. There's not a whole lot more to it.
"He had a chance to win the first set and he didn't take it. I had a chance to win the second set and I didn't take it. I just struggled from then on.
"I'm very disappointed, obviously. But I think I've been more disappointed. In other Grand Slams, when you get closer to winning the tournament, I think it becomes a lot harder to take."
Crystal Palace manager latest: Malky Mackay ruled out due to messy departure from previous club Cardiff
Sami Khedira to Arsenal: Midfield omitted from Real Madrid squad for Spanish Super Cup
David Gold furious after Carlton Cole parody account mocks up a picture of West Ham chairman as a suspect in the Madeleine McCann case
Manchester United's worst signings
Angel Di Maria latest: Manchester United target is Real Madrid's 'best player', says Diego Simeone
- 1 Richard Dawkins on babies with Down Syndrome: 'Abort it and try again – it would be immoral to bring it into the world'
- 2 ALS ice bucket challenge co-founder Corey Griffin drowns, aged 27
- 3 World peace? These are the only 11 countries in the world that are actually free from conflict
- 4 Nicki Minaj finally releases predictable 'Anaconda' video
- 5 James Foley 'beheading': Met police warn public watching murder video could be criminal offence
Scottish independence: English people overwhelmingly want Scotland to stay in the UK
Isis threat: Cameron wants an alliance with Iran
Crisis? What crisis? A visiting US doctor gives the NHS a rave review
Michael Brown shooting: Chaos erupts on the streets of Ferguson after autopsy shows teenager was shot six times – twice in the head
Richard Dawkins on babies with Down Syndrome: 'Abort it and try again – it would be immoral to bring it into the world'
Scottish Independence Referendum: Salmond described as 'arrogant, ambitious and dishonest' by Scottish women