I think Canelo will give Floyd fits early and Mayweather will come on late to get a controversial decision. After the fight Mayweather fans will claim it was a shutout for Mayweather.
i think the vast majority of Mayweather fans, myself included, are fully aware and acknowledge that he is vulnerable during the first 3 rounds. These seem to be consistently the only rounds that Mayweather is susceptible to losing (and when he's been buckled).
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