The Englishman has triumphed at the Crucible on six occasions, but there have been several painful defeats as well.
We all remember his famous victories in Sheffield, yet what about the World Championship losses Ronnie O’Sullivan has suffered down through the years?
The current world number two is arguably the greatest player that has ever picked up the cue, and he has a lot of the sport’s records to help prove it.
In 2021, the 45 year-old will be bidding to match Stephen Hendry’s haul of world titles that was set 22 years ago when the Scot claimed the last of his magnificent seven crowns.
O’Sullivan got off to a positive start on the opening day of this year’s edition, firing in a trio of century breaks to wrap up a comfortable 10-4 victory against debutant Mark Joyce to reach the last 16.
However, it has not always been straightforward for O’Sullivan in snooker’s spiritual home, which has entangled all the greats in its pressured web at one point or another.
Since his debut in 1993, O’Sullivan has lost 22 times at the Crucible to 16 different players, with at least one loss coming in each of the five different rounds.
Two players have managed the hat-trick by overcoming the Rocket on three occasions in Sheffield, while two others have enjoyed the thrill of knocking O’Sullivan out twice.
Whether he’s the tournament favourite or not – although he usually has been – the World Championship losses for Ronnie O’Sullivan inevitably generate a huge amount of headlines.
The question is, can you remember all of them?