Way back when the Gracie family introduced the MMA fighting it was open rules. Different styles against each other. One of the Jujitsu guys took on a boxer. In that fight the boxer was out in seconds.
Boxers tend to backup while MMA guys charge. MMA also fight basilclay bare knuckle, so McGregor will be able to take the punches from Mayweather.
I just don't see Mayweahter dancing his way out of this one!
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