Mayweather posted a picture on his Twitter account Wednesday morning of a betting slip from the M Resort in Las Vegas that showed he won $37,272.75 on the Bulls, who faced the Atlanta Hawks the previous night.
The tweet read: "My lil brother Derrick Rose will always get you Paid."
According to the photo, Mayweather made a halftime bet that the Hawks wouldn't outscore the Bulls by six points or more in the second half. The Bulls made 73.8 percent of their shots in the first half, which ended with a Rose 3-pointer, to go up 72-43.
Mayweather apparently laid down the expensive halftime bet with the Bulls getting 5.5 points.
The visiting Bulls outscored Atlanta 42-38 in the second half, easily winning the bet for Mayweather.
"We can't really discuss it," M Resort sportsbook supervisor Jorgen Johnson said in a phone conversation. "It's a privacy issue. He does like to put his tickets on Twitter."
Jon Greenberg is a columnist for ESPNChicago.com.