Can you think of any fights that would have ended differently if it was only a 12 rounder like today?

I think the main one for me would be Sugar Ray Leonard Vs Thomas Hearns in 1981. Hearns was ahead on all scorecards after 12 rounds and was then knocked out in the 14th. If the fight had only been 12 rounds then the whole history of boxing could have been changed. Leonard admits it was the biggest fight of his career and really the one that pushed him to superstar level. If Hearns had won that fight outboxing Leonard questions would have been asked especially after Leonard's loss to Duran and the fact that his victory in the No Mas fight was so controversial. Also it would have turned Hearns into a megastar and shown his boxing ability as well as his immense power that he showed against Pipino Cuevas and later Duran. I just wonder whether Leonard would even be remembered as a great champion today if it wasn't for the extra 2 rounds. I think he may well be remembered as someone who had the potential and didn't deliver on it. I would also not be surprised if Leonard would have retired after his detached retina as he hinted to journalists he would have. Also Hearns would have met Hagler when Marvin was less feared and dangerous and I would not have been surprised if Hearns had beaten him. So the outcome of this fight really changed the course of boxing history. Without the extra 2 rounds we could very easily be placing Thomas Hearns among the best of all time and many wouldn't even know who Ray Leonard was.