Logan Paul claims in social media post that Floyd Mayweather owed him money.
In June, the YouTube star and boxing legend went head-to-head in an eight-round pageant bout in Miami.
Mayweather claimed to have earned $100 million (£75m) before and after for a ‘legitimate bank robbery’.
But Paul claims the American giant owed him money after he posted an edited photo of Mayweather in girls’ shorts.
And he wrote: “Pay me my money *** in a human @floydmayweather’s corn vessel.”
Mayweather, 44, officially retired in 2017 after defeating 33-year-old UFC superstar Conor McGregor in a lucrative crossover bout.
But he has returned twice, in both appearances, starting with a round of demolition work on featherweight kickboxer Tenshin Nasukawa, 23.
Most recently, in June, he was covered by 26-year-old Paul, who was over eight rounds, weighing two stone more.
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Despite boasting of a lucrative payday, Mayweather is adamant that this was his last cameo in the ring and was never a ring thing in the first place.
He told the press in December: “I don’t miss boxing, I just go and have fun, so I did an exhibition with Logan Paul, we had fun, I had fun.
“We gave people a little fun and people need to know that there’s a difference between a real fight and an exhibition.
“With an exhibition I was only training from time to time. If it was a real fight there would be blood from the start.”