Snooker's governing body is investigating Steve Davis's third-round match against Thepchaiya Un-Nooh of Thailand at a Players Tour Championship event following reports of irregular betting patterns.
Davis, a six-time world champion, won the match 4-0 against the world No 79 during the third tournament in the series at Gloucester's South West Snooker Academy. He is not believed to have breached any rules.
A statement from World Snooker (the WPBSA) said: "We have become aware of unusual betting patterns on a match that took place on Saturday 8 September between Thepchaiya Un-Nooh and Steve Davis.
"This matter has been referred to Nigel Mawer, head of the WPBSA's integrity unit, to make preliminary enquiries to establish what has taken place and to consider if any action is appropriate."
Jason Ferguson, the chairman of World Snooker, said: "The WPBSA has a network of international partners to monitor such issues. We take any potential breach of the members' betting rules very seriously. Any player found guilty of such a breach is likely to be banned for life from snooker. Protecting the integrity of the sport of snooker is of paramount importance."