Mayweather was sitting ringside when Big Show assaulted Mayweather's friend Ray Mastereo. 5"8 Mayweather got pretty pissed and broke 7"2 Big Show's nose. The next day, Mayweather accepted a fight vs the Big Show.
Mayweather says none of it was scripted.
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^this videos got mayweather attacking big show in the beginning and then the night after with the match being announced and big show with a thing on his nose.