Here are the list of moves a Floyd Mayweather Jr. character can perform:

1. Run around the ring
2. Shoulder Roll
3. Potshots
4. Trashtalk opponents -> Up, Trianlge, Down, X, Left, Square to perform

The developers figured and rightly so that the gamers wouldn't want to use a character with such limited moves. Hence they scrapped Mayweather and replaced him with Vic Darchinyan.