Floyd Mayweather issues ‘100 percent’ guarantee he’ll KO Conor McGregor

2:59 PM ET

LAS VEGAS — Floyd Mayweather’s reputation is as one of the greatest defensive fighters of all time. As the highest-paid fighter in history, he has grossed nearly $1 billion in large part because of his “Money” persona and the skills to back it up.

So it may come to a surprise to some that Mayweather — giving his best Joe Namath Super Bowl III proclamation — is guaranteeing he will knock out Conor McGregor, the UFC star crossing over to boxing for a huge money fight when they meet on Saturday (Showtime PPV, 9 p.m. ET) at the T-Mobile Arena.

“One hundred percent, it will not go the distance,” Mayweather told ESPN on Wednesday. “One hundred percent chance this fight won’t go the distance.”

Mayweather’s greatest skill is on defense, where he is supremely difficult to hit with a clean punch. And while he often makes his opponents pay by landing his own assortment of shots, one thing he is not is a knockout artist.