Sugar Ray Robinson vs. Jake LaMotta

Sugar Ray Robinson and Jake LaMotta had a historic boxing rivalry, fighting each other on six occasions between 1942 and 1951. Robinson won the series 5–1, although many of the fights were close, with LaMotta handing Robinson his first ever loss (which remained his only loss for nearly a decade). The most famous of their encounters was their sixth and final fight, a world middleweight title match later dubbed The Saint Valentine's Day Massacre due to its brutality, with the champion LaMotta taking tremendous punishment from Robinson in the later rounds.