Defending champion Mark Williams went to hospital with chest pains after the first session of his World Championship second-round match on Friday.
Williams, a three-time winner at the Crucible, was 5-3 down to Englishman David Gilbert at the end of play.
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And the 44-year-old posted on Twitter to inform fans that he was having pains in his chest looked at between sessions.
"A&E. Could be hear [sic] a while," Williams wrote. "Couldn't stick the chest pains no more. Lucky there wasn't any more frames to play."
The Welshman was reportedly advised by a doctor at the Sheffield venue to go to hospital.
A&E. Could be hear a while , couldn’t stick the chest pains no more. Lucky there wasn’t any more frames to play . #bettergetcheckedoutsafethansorrry
— MARK WILLIAMS M.B.E (@markwil147) April 26, 2019
