Watson's professional career lasted from 1984 to 1991. The highlight was his May 1989 victory over
Nigel Benn to secure the British Commonwealth middleweight title. This led to a world title clash with Jamaican
Mike McCallum, who defeated Watson by a knockout in the eleventh round. On 22 June 1991 at Earl's Court, he met Chris Eubank in another opportunity for the world middleweight title. Eubank won by a majority decision of 116–113, 115–113 and 114–114, close enough to incur dissent from some commentators and supporters.
Rematch with Eubank and career-ending injury A rematch was arranged on 21 September 1991 at
White Hart Lane, this time for the vacant WBO super middleweight title. In round 11, with Watson ahead on points and seemingly on the verge of a stoppage victory, he knocked Eubank down with an overhand right. Moments later, Eubank was back on his feet and connected with a devastating uppercut, which caused Watson to fall back and hit the back of his head against the ropes. Referee Roy Francis stopped the fight in round 12, after which Watson collapsed in the ring. There was no ambulance or paramedic at the event. He spent 40 days in a
coma and had six brain operations to remove a blood clot. After regaining consciousness, he spent over a year in intensive care and rehabilitation and six more years using a wheelchair ==Life after boxing==