US Open, Flushing Meadows
Dates: 30 August - 12 September Start time: 1600 BST
Coverage: Live text commentary on BBC Sport website and mobiles; updates on BBC Radio 5 live; live on Sky Sports
Andy Murray was at a loss to explain the physical problems he suffered during his surprise defeat by Stanislas Wawrinka in the US Open third round.
The Briton, seeded fourth, appeared unable to move freely after requiring treatment on his thigh in the third set and his neck in the fourth.
Wawrinka eventually came through 6-7 (3-7) 7-6 (7-4) 6-3 6-3.
And Murray was unclear on his physical issues, saying: "I still feel like I'm super fit, I just didn't feel great."
He added: "There was a lot of things that I was feeling on the court but I just haven't felt that way for a few years now, so I'm going to have to go look at why that was the case and try and get better."
Murray said he was "still moving okay" in the latter stages of the match despite the two bouts of treatment from the trainer.
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"The first time, [it was] just tightness in my quad; the second time, just getting sort of pins and needles around my right elbow," he explained.
The 23-year-old had earlier described his physical problems as "just part and parcel of playing that sort of length of match" and was at a loss to explain why he fell away so dramatically.
"I don't know," he said. "I haven't been really tired in any long matches for a long, long time. So whether it was fatigue or not, I don't know."
Murray became increasingly frustrated as the match wore on, railing at the umpire during the first set tie-break and repeatedly castigating himself and looking to his supporters' box as the tie slipped away.
Asked about his demeanour, Murray admitted: "I was disappointed that I was struggling physically. I tried to find a way to come back. Didn't quite do it.
"I was disappointed but I've not been really in that position for a long time, so that may be something to do with it."
In a match of wildly fluctuating fortunes Murray served for a two-set lead at one point, having recovered from 5-2 down to take the first.
I didn't think it was a terrible performance today. I don't think I played terribly
And he put the defeat down solely to the performance of his opponent.
"He played better than me," said Murray. "There's not a whole lot more to it. He had a chance to win the first set; didn't take it. I had a chance to win the second set; didn't take it. I just struggled from then on.
"I didn't think it was a terrible performance today. I don't think I played terribly.
"It's very different playing against a guy like in my second round than playing a guy like Wawrinka. He's a much better player."
Murray had come into the tournament rated by many as a better bet than world number one Rafael Nadal but such an early and seemingly inexplicable loss raised the inevitable questions about his ability to win a first Grand Slam title.
"I have no idea of whether I'll win a Grand Slam or not," he said. "You know, I want to but if I never win one, then what? If I give 100%, try my best, physically work as hard as I can, practice as much as I can, then that's all I can do."
Murray arrived in New York without a coach having parted company with Miles Maclagan last month and he still plans to find a replacement, but insisted he was not about to change the rest of his support team.
"I'll speak to all the guys I work with and see what's gone well this year, what hasn't gone so well," he said.
"You know, it's one match. I wish I'd played better but I'm not going to panic and start trying to analyse everything that's going on, because I've been pretty much injury-free the whole year.
"Physically I felt good the whole year. You know, I played some of my best tennis in two of the majors this year. So I want to improve and get better. I'm obviously going to look for a coach and people that are going help me to do that.
"But I'm happy with the guys that I work with just now. They're all very, very good at what they do, so I'm not going to start changing everything. I'm still looking for a coach. That's it."
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