Tomas Berdych refused to elaborate on his objection to an umpire's call during the third set of his loss to Marin Cilic at the US Open.
The Czech sixth seed bowed out in the quarter-finals as Cilic posted a 6-2 6-4 7-6 (7-4) victory to advance to his second career grand slam semi-final.
However, the former Wimbledon finalist was poised to send the match to a fourth set when he held a 4-2 lead and serving with 30-15, Berdych crumbled when a double-bounce call went against him.
Replays showed chair umpire Louise Engzell made the correct call, but Berdych was furious with the decision - and handed back his break advantage before losing the tie-break.
He was, however, less keen to discuss the matter post match as he was with Engzell at the time.
"No, I pretty much said everything, so let's leave it to decide whoever saw it and whoever understands tennis. That's it," Berdych said.
Berdych did rue his own poor performance, blaming his biggest weapon - his serve, which he landed only 50 per cent of the time on his first ball - for his collapse.
"I started pretty terribly. It was not the way to start the match like that. Then obviously was really tough to catch up. And really my serve was off," he said.
"Basically when you have a game built on a serve, then it's really tough and difficult to reschedule it and do it a bit differently.
"Today was not, definitely not the day I want to have. Yeah, that's it. That's tennis. Just need to carry over and go forward."
He added: "Yeah, it was [my] serve definitely. I mean, it was horrible from the beginning. That's impossible to play with an opponent like Marin is.
"Really, I would probably struggle with 80 per cent of other guys if I served that bad like today. That's something what really I need to avoid."