In December 2012, Juan Manuel Marquez finally landed the punch he had spent 10 years and three-and-a-half fights looking for. With a single second remaining in Round 6 of their fourth fight, he put Manny Pacquiao to sleep.
The knockout is the single most exciting moment in sports. Only the walk-off homer in baseball can compare.
Boom and it's all over, with the fans left to catch their breath.
I've tried to balance between sudden drama, pure aesthetics and historical significance for this list. My own bias as a writer and historian has led me to come down most heavily on significance.