ROCKY MARCIANO RETIRES – The Brockton Rock won 49 straight
April 27, 1956 – Undefeated World Heavyweight Boxing Champ Rocky Marciano announced his retirement. The Brockton Rock had won all 49 of his fights, with 43 wins coming on knockouts.
He successfully defended his title six times. Marciano first became the heavyweight champion when he knocked out Jersey Joe Walcott in 1952. He was killed in an airplane crash the day before his 46th birthday.