Jake LaMotta vs Sugar Ray Robinson - 13th Round

On February 14, 1951, Robinson and LaMotta met for the sixth time. The fight would become known as The St. Valentine's Day Massacre. Robinson unleashed a series of savage combinations on LaMotta for three rounds finally stopping the champion for the first time in their legendary six bout series- in the 13th round and giving LaMotta his first legitimate knockout loss in 95 professional bouts.