Full name
Marvin Nathaniel Hagler

Birthdate
May 23, 1954

Debut
On May 18, 1973, in Brockton, Massachusetts, he knocked out Terry Ryan in two rounds.

won the world title
On September 27, 1980, at Wembley, England, he defeated Alan Minter by technical knockout in three rounds and snatched the middle titles recognized by the WBA and the WBC. On May 27, 1983, in Rhode Island, he knocked out Wilford Scypion in four rounds and won the IBF middle belt.

Achievements
In 1987 he fought Sugar Ray Leonard and lost on points in a very close decision that is disputed to this day as many saw Hagler win.

Lost His Title
In his 13th defense, he only exposed the WBC middle belt on April 6, 1987, in Las Vegas, Ray Leonard defeated him by unanimous decision.

Withdrawal
On April 6, 1987, following his loss to Ray Leonard