Floyd Mayweather Jr. is prepping for his Sept. 19 boxing bout with Juan Manuel Marquez at the MGM Grand Garden Arena (some AMC movie theaters will be simulcasting live in addition to HBO pay-per-view, check your local listings).

Last month, another of his cars was involved in a shooting at the Crystal Palace Skating Center in Las Vegas.

And now JP Morgan Chase Bank has slapped a $167,000 lawsuit on him for not paying the rest of his car loan on his Mercedes Maybach 57S.

The luxury sedan, valued at $512,000, was purchased at a whopping 16 percent annual interest rate of over $415,000 (that would be $9,077 every month for 72 months). He owed $363,000 when the bank repossessed it and received $196,000 for it. The $167,000 remaining is the amount the bank is seeking to reclaim.

The 32-year-old boxer still has a $6.17 million bill from the IRS for unpaid taxes. And that's just one of many.

There's little doubt the real reason why Mayweather came out of his 11-month retirement to defeat Ricky Hatton and then his 16-month retirement to fight Marquez.