Born December 5, 1975
Lives Chigwell, Essex, England
Nickname "The Rocket"
Turned pro 1992 
 
Match stats 1998/99 ranking events; 1999/2000 ranking events 
Highest pro break 147 (six times: 1997 Embassy World Championship, 1999 Welsh Open, 1999 Grand Prix 2000 Regal Scottish Open, 2001 LG Cup, and 2003 Embassy World Championship (video))
Highest ranked 1 (2002, 2004, , 2005)
Current ranking 3
World Championship best Winner two times (2001 and 2004) 
Best ranking event performance Winner of 18 tournaments: UK Championship 1993, 1997, 2001; British Open 1994; Asian Classic 1996; German Open 1996; Scottish Open 1998, 2000; China International/Open 1999 (December), 2000; World Championship 2001, 2004; European Open 2003; Irish Masters 2003, 2005; Welsh Open 2004, 2005; totesport Grand Prix 2004 
Major invitation tournament victories:  Masters 1995, 2005, 2007; Regal Scottish Masters 1998, 2000;, 2002; Liverpool Victoria Charity Challenge 1996; Champions Cup 2000; Irish Masters 2001 
Career centuries 154 (end of 1997/98 season)
Career earnings £2,409,780 (through the 2001 Thailand Masters)
Speciality Wrong-handed play

Ronnie made his first century when he was 10 years old. At 15 yr 98 days he became the youngest player ever to make a maximum in tournament play, during the English Amateur Championship (Southern Area) at Aldershot, Hants on 13 Mar 1991. Seven years later he made a maximum in just 5 min 20 seconds in the 1997 Embassy World Championship.
He has won 36 titles in all (from 50 finals), his most important being the 2001 Embassy World Championship and the 2004 Embassy World Championship. The 1993 UK win made him the youngest ever winner of a ranking event, at 17 yr 11 mn.

O'Sullivan is one of only five players to win both the World Championship and the UK Championship in the same year. Steve Davis, Stephen Hendry, John Parrott and John Higgins are the others.

In 1993 he won the WBSA Young Player of the Year award and the following year he was named Player of the Year.

He beat Ken Doherty in the final of the 1998 Benson & Hedges Irish Masters, but he was later stripped of the title after failing a drug test.

During the summer of 1992, Ronnie won 38 consecutive matches in qualifying competition. 
 
Famous for playing with his left hand. Claims to have made a century while practicing that way.