Stephen Maguire was rocked by one of the biggest upsets in snooker history tonight as he lost 10-9 to rank outsider Dechawat Poomjaeng in the first round of the Betfair World Championship.

Scottish potter Maguire reached the semi-finals at the Crucible last season but was shaken up by world number 70 Poomjaeng, who only joined the main professional tour last season and whose antics endeared him to the crowd but seemingly not to Maguire.

The Thailand player laughed and smiled along with spectators and repeatedly apologised when the run of the ball favoured him, but Maguire rarely saw the funny side as he endured perhaps the worst defeat of his career.

Like Graeme Dott's match against Peter Ebdon, it went beyond the scheduled two sessions, largely due to Poomjaeng's meticulously slow play on his World Championship debut.