Stevens started playing young, achieving his first aged just 12. He turned professional aged 20, and reached the semi-finals of the
World Championship aged 21. In 1984 he achieved a maximum 147 break in a televised match against
Jimmy White in the
Benson & Hedges Masters, which remained the only such break ever made in the competition until
Ding Junhui achieved the same feat in 2007. His stylish choice of attire (he often appeared at major tournaments wearing an all-white suit, as opposed to the traditional black suit with a white shirt) and his youthful 'popstar' good looks made him a pin-up. In 1985 he was wrongfully accused of taking stimulants before the final of the Dulux British Open Snooker Championship by South African
Silvino Francisco. Stevens lost 9–12. Francisco was subsequently fined by the world governing body of snooker, the WPBSA, for the comments. The
WPBSA accepted that the accusation was false and it is on record that Stevens has never failed a drugs test in the history of his career. Shortly after the comments were made public, Stevens admitted to an addiction to cocaine in his personal life. On September 23, 2019, Jimmy White published an apology to Stevens on White's official
Facebook page stating that in his autobiography
Second Wind he misremembered a few stories as occurring with Stevens that in fact did not. These events were widely broadcast in the media and White wanted to make the apology public to prevent them from being repeated. White further stated that he did not intend his words to be interpreted as meaning that Stevens introduced him to
crack cocaine or that Stevens ever played WPBSA snooker under the influence of drugs. ==Performance and rankings timeline==