VIDEO: Ricky Hatton caught snorting cocaine
Mayweather's 10-year-old son told police he witnessed his father hitting and kicking 30-year-old Josie Harris during the argument at Harris' home in southwest Las Vegas.
The 33-year-old Mayweather hasn't been charged with domestic battery or assault.
He turned himself in on Friday and was freed from jail on $3 000 bail after being booked on a grand larceny charge over the missing cell phone.
He's due in court November 9.
Mayweather's lawyer, Richard Wright, wasn't available on Monday.
On Friday, he denied wrongdoing on Mayweather's behalf.