TMZ - cops say Floyd Mayweather Sr. attacked a woman that night and now there's a warrant out for his arrest.
But, Floyd Sr. says the allegations are 100% not true.
Law enforcement sources tell TMZ Sports ... the alleged incident went down in Vegas the early hours of Sept. 17 ... following the big Canelo vs. GGG fight.
The alleged attacked apparently happened when Floyd Mayweather Sr was trying to get a girl out of his car after attending a fight. He ALLEGEDLY pulled her out of the car after she wouldn't leave. While pulling her out of the car he ALLEGEDLY punched her in the leg. The woman is now being treated in the hospital for minor injuries.