Yeah and went on to win the fight so what's you point
Cotto gave it his best and won. Diaz gave it his best and got knocked out
I guess where there is no room for tactical improvement, the only factors that could contribute to a different outcome are changes in either physical or mental states.
IMO it was clear that Diaz was banking on now having a Mental & Physical advantage over Marquez due to the prolonged and embarrassing nature of Marquez' previous defeat at the hands of Floyd Mayeather along with the speculated wear and tear that was associated with his long career.
I don't think anyone really knew what Marquez was gonna look like in this fight and he showed that his is still a warrior and a smart fighter but IMO that's a bit too easily said when facing an opponent who isn't really prepared to assert themselves.
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