Floyd Mayweather is not about to let Conor McGregor ride off into the sunset without at least a parting shot. McGregor (22-4 MMA, 10-2 UFC), the former UFC lightweight and featherweight champion, announced his retirement Saturday night following UFC 250. It was the third time in four years that McGregor has tweeted he’s retiring from fighting. Mayweather (50-0 boxing) responded Sunday by dropping a comment on McGregor’s latest
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