Logan Paul claims Floyd Mayweather still owes him $1.5 million from their 2021 exhibition fight, a bad look for Mayweather and a dispute that shows how messy celebrity boxing money can get.

• Paul says Mayweather took a $10 million cash payment for selling their fight using Paul's name and likeness.
• Paul's deal entitled him to 15% of any such proceeds, which he says he never received.
• Mayweather also failed to follow through on a promised fight, believed to be with backers in Dubai, that was part of the arrangement.
• Paul is publicly calling Mayweather out and says he wants the cash.

Outlook: Expect the feud to play out in public and possibly in court, with no sign Mayweather is ready to pay.