Question: In which year was this American heavyweight boxer born who was active in the 1950s through the 1970s, and was defeated by the former Canadian professional boxer George Chuvalo?
Sentence (from "Mike Tyson"): He won the WBC title in 1986 after stopping Trevor Berbick in two rounds, and added the WBA and IBF titles after defeating James Smith and Tony Tucker in 1987.
Relevant evidence: No