Is Mike Tyson a two-time heavyweight champion of the world?

Answer 1

Tyson won his first title, the WBC heavyweight title, in 1986 when he TKOed Trevor Berbick in the second round. He won the WBA heavyweight title by beating Bonecrusher Smith by a unanimous decision in 1987. He then won the IBF heavyweight title by beating Tony Tucker in a unanimous decision, also in 1987. He became the 'undisputed' heavyweight champion of the world.

Tyson lost the 'undisputed' title to Buster Douglas in 1990.

He won back the WBC title from Frank Bruno and the WBA title from Bruce Seldon in 1996. He lost the WBA title to Evender Holyfield in 1997 and was stripped of the WBC title shortly after winning it for not agreeing to fight Lennox Lewis.