Mayweather and McGregor famously dueled in a landmark crossover boxing rules contest in 2017, which Mayweather won by 10th round stoppage.
Their paths were, perhaps, always destined to merge as McGregor, just like Mayweather, elevated his prizefighting reputation with a flambouyant lifestyle, luxurious purchases, and headline-grabbing statements.
Mayweather described his former opponent as the "caucasian Floyd Mayweather," adding: "He's a knock-off version, a hell of a knock-off version."
He went on, however, to offer the Irishman praise, saying he'd take his hat off to him because "he's a dog."
Mayweather has long been linked with a move into mixed martial arts. He recently knocked out the kickboxer Tenshin Nasukawa in an exhibition bout on December 31 in Japan, and though he has reiterated he is retired, he continues to be asked about whether he'd compete in the UFC Octagon.
Mayweather told Hart that "anything is possible" and that he could "go get a deal right now from the UFC for $3 billion or $5 billion if that's what I wanted."
However, he added that his life is great and that he can buy whatever he wants "every month," so it's likely he's in no rush to get into the Octagon at 41 years old.
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