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LAS VEGAS—The boxing match between Floyd Mayweather Jr. and Conor McGregor wasn’t supposed to be a fair fight.

But for the first half of Saturday’s bout, Mayweather appeared every bit like a 40-year-old who hadn’t been in the ring in two years. While the 29-year-old McGregor, a boxing novice, looked a fighter who actually belonged in the same ring as the undefeated Mayweather.

But as the fight wore on, Mayweather began to…