Pacquiao vs. Márquez IV (2012)

Pacquiao vs. Márquez IV delivers the most stunning knockout in boxing rivalry history—Márquez’s perfectly timed counter right that left Pacquiao face-down and unconscious in the sixth round. The three prior razor-close fights set a volatile stage, but this decisive ending dramatically outperforms the inconclusive decisions of #1 Ali vs. Frazier III and #10 Lewis vs. Klitschko. CompuBox stats revealed Márquez landed only 95 punches to Pacquiao’s 149 before the fatal blow, yet his 42% power-punch accuracy proved deadlier. This bout, ranked #9, captures a rivalry where each second carried the weight of 24 prior heated rounds.