I hear people mention it as one of the best 1-punch KOs ever, but personally I don't consider it a one-punch KO. An awesome KO, but Duran had been down twice in hurt late in round 1, and already hurt in the 2nd round when Hearns landed that final right hand. The fight just didn't end on a combination, but I don't think of it as a true one-punch KO like Nunn-Kalambay, Marciano-Walcott 1, Robinson-Fullmer 2, Spinks-M. Johnson, Tyson-Botha, etc.. [ame]http://www.youtube.com/watch?v=9DvPFKii9-A[/ame]
Great question. It was not a one punch knockout. Hearns hit him over and over. Hearns actually hurt Duran with a counter left hook in round one which started the 2 knockdowns of Duran in round one. Then Duran recovered a little and hit Hearns with a right off the ropes, and after that Tommy again started to land heavy rights on Duran until he had Duran wobbling and then he got Duran on the ropes with Duran not having anywhere to go and Tommy did the jab to the body and right on top.
If Hearns would have landed that punch before the other KDs, I put 1K down, the Ref would reach 10 before Duran got up and was "Oked" to continue.