Mark Williams has apologised after he fell asleep during his second round defeat to Anthony Hamilton at the UK Snooker Championship on Sunday.
Despite winning the opening three frames, world number nine Williams lost 6-5 to Hamilton.
The 46-year-old Welshman contracted Covid-19 in October and said he is still not feeling 100 per cent well.
"30 years as a professional, that's the first time I've ever fell asleep in the chair," said the three-time world champion.
"It was 3-2 and I was out. My head went down and I woke up and I didn't have a clue where I was for about five seconds.
I would like to apologise to anyone watching tonight , in 30 years as a pro I have never ever fella asleep in my chair before , it's was nothing to do with Anthony btw, I just don't feel well from covid. Bit embarrassing amd not professional. #camtleepmywyesopenatnigjtimafrowd
— MARK WILLIAMS M.B.E (@markwil147) November 28, 2021
"It was a bit embarrassing but I was just shattered.
"I need to be playing in the mornings really, or afternoons. The more the day goes on the more tired I get.
"It's disappointing but there's a lot worse people that have had Covid than I've had it, so I'm one of the lucky ones really.
"It's definitely better than what it was a couple of weeks ago so I've just got to keep going, but if I play night matches I'm going to really struggle."
World number 56 Hamilton will face Ricky Walden in the last 32.
"I was twitching all over the gaff at the end, like I was 20," he said about Sunday's win.
"That's why I want to stay on the tour. You only get that [feeling] skydiving and playing snooker. You won't get that when you retire. These matches and emotions are hard to come by. That's why I want to stay on the tour for another couple of years and get as many of them as possible."
Anthony Hamilton beats Mark Williams at UK Championship
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