LAS VEGAS — Floyd Mayweather Jr., in a span of just a few seconds, did what he does best. First he put on a boxing clinic, scoring a 10th-round technical knockout over Conor McGregor in a highly-anticipated bout between the boxing superstar and mixed-martial arts champion. And then Mayweather jumped on the ropes, barking to the crowd and making sure everyone properly acknowledged what he’d just done. | More…

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