Ronnie launches a rocket at refspublished at 09:20 British Summer Time 20 May 2015
Ronnie O'Sullivan, never one to make a controversial statement, has criticised the standard of refereeing in the sport.
The 39-year-old lost to eventual winner Stuart Bingham at the World Championships in Sheffield last month.
"The referee who was overseeing my game with Stuart Bingham kept walking around the table while I was on the shot," O'Sullivan said in his Eurosport blog, external.
"I've had a few ding-dongs with referees this year. The standard of some of the refs has been below par. There's nothing worse then a ref breaking your rhythm."