Andy Murray has insisted there was "nothing different" about the preparation for his Wimbledon quarter-final with Grigor Dimitrov.
Reports have pointed to Murray ranting towards the players' box during the three-set defeat on Wednesday that ended his defence of the title.
The Guardian reported that courtside photographers heard Murray shout "Shut the f*** up!" and "Five minutes before the f****** match!" towards his team as the match slipped away from him.
There has been no indication of what may have prompted Murray's remarks, although it is not unusual for the 27-year-old Scot to chunter to himself, express anger towards his support team and let expletives slip on court.
Murray, who was watched from the Royal Box by the Duke and Duchess of Cambridge, said in his BBC Sport blog that the run-up to the match ran as planned.
"There was nothing different in the build-up and no reason to expect that kind of performance," Murray said.
"The timings changed a bit because we played the quarter-final pretty early compared with some of my other matches, but my routine was the same and I practised with James Ward both days.
"I was nervous, I felt the butterflies and was excited about the match, but that's perfectly normal. I didn't feel overcome by the moment, but I certainly wasn't very good when I got out on court."
Dimitrov had sensed Murray was off his game from as early as the warm-up.
The Bulgarian said: "As soon as we hit the first ball on the court I felt something was just a little different. I just had to go with the flow."