There's no way there's not a rematch if Mayweather loses, no matter how he loses. He could get brutally dominated for 8 rounds and there would still be a rematch.
IF Canelo KO's Floyd then there will be a rematch. However, Canelo would be in a position of power and will probably dictate the terms (weight, gloves, ring size, etc.), unless the rematch clause explicitly states that the rematch must be on the same terms as the first fight.
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