How it unfolded
This was the sixth meeting between the two men. Robinson had suffered his first professional loss to LaMotta in Detroit in 1943 and had not lost to him since. Having moved up from the welterweight crown to middleweight, Robinson had the new division's title on the line here. Some 14,000 packed Chicago Stadium on Valentine's Day. LaMotta, with the weight advantage, pushed the pace early, but from the middle rounds on Robinson's speed and combinations took over the fight. After the 10th round LaMotta effectively gave up counterattacking and simply leaned on the ropes and took punishment, yet never went down. At 2:04 of the 13th round, referee Frank Sikora stopped the fight, saying he could not watch any longer. LaMotta never touched the canvas, a fact he later spoke of with career pride. The fight became known as the 'St. Valentine's Day Massacre.'
Why it still matters
This was the moment Robinson, often ranked the greatest pound-for-pound fighter ever, conquered a second weight class, and the endpoint of a rivalry stretched across six fights. Robinson went on to reclaim the middleweight title five separate times and effectively invented the very idea of pound-for-pound greatness, and this fight is the template for how a rivalry can elevate both fighters into history.