'He's a lot better than I thought he'd be,' a jubilant Mayweather said of McGregor. 'He's a tough competitor, but I was the better man tonight'?

Blow by blow: How the Mayweather-McGregor fight went down

Former boxing welterweight champion Floyd Mayweather, 40, takes on mixed martial arts star Conor McGregor, 29, early Sunday morning in Las Vegas

In 'richest fight ever', underdog McGregor vows to knock out Mayweather

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Blow by blow: How the Mayweather-McGregor fight went down

In 'richest fight ever', underdog McGregor vows to knock out Mayweather