Snooker: The Gambling Commission in Britain will investigate matches at snooker's Malta Cup after irregular betting patterns were spotted during the invitational tournament.
The round-robin format produced some matches with nothing at stake and bookmakers were alarmed by unusual flows of money during in-play markets.
A spokesman for the World Professional Billiards and Snooker Association (WPBSA) refused to cite which of the 33 matches at the event are under investigation by the gambling regulator.
The tournament was won by Shaun Murphy, who claimed a 9-3 victory over Ken Doherty in Sunday night's final in Portomaso.
A statement from WPBSA said: "We have as agreement with the Association of British Bookmakers whereby we are contacted confidentially if and when irregular betting patterns are detected.
"In such cases, the match in question is carefully monitored by our most senior officials and a thorough assessment of the players' performance is made. In past incidents, where players have been judged guilty of match fixing or intention to match-fix, which are extremely rare, we have taken a particularly stringent line."
The penalties for being involved in match-fixing, which is a criminal offence, are severe. As well as suspension from the game it can also carry a prison sentence of up to two years.
In the past, former players Quinten Hann and Peter Francisco have been recipients of bans related to match-fixing. Francisco received a five-year ban in 1995 while Hann got an eight-year suspension in 2006.