US heavyweight boxer, Mike, b. 1966 (5)
I believe the answer is:
tyson
(Other definitions for tyson that I've seen before include "Mike --, US boxer" , "Undisputed world heavyweight champion, 1987" , "26 4 [RING MASTER]" , "Youngest ever undisputed world heavyweight boxing champion, b, 1966" , "US world heavyweight boxing champion, b.1966 -- English fast bowler, d. 2015" .)