From Boxrec Boxing Encyclopaedia
- Floyd Mayweather Jr. 39-0 (25 KOs) vs. Juan Manuel Marquez 50-4-1 (37 KOs)
- For Mayweather Jr., it was his first bout in a year an nine months following his temporary retirement. Marquez was coming off his world title knockout victory over Juan Diaz seven months earlier.
- The fight, originally scheduled for July 18th, was postponed due to a rib injury suffered by Mayweather Jr.
- During training leading up to the bout, Mayweather Jr.'s uncle and trainer Roger Mayweather was arrested on felony coercion and battery-strangulation charges at a Las Vegas apartment in an attack on a female boxer he once trained.