Enter the following as your name at the "Create a Character" in Career mode to play as the following person...

MECCA - Ashy Knucks

MRBARRY - Barry Sanders

OSUNA - Bernando Osuna 

HATCHER - Charles Hatcher 

ZITO - Chuck Zito

BOSTICE - David Bostice

DEFIAGBN - David Defiagbon 

DEMART - David DeMartini

JGIAMBI - Jason Giambi 

BAILEY - Joe Mesi

JBOTTI - John Bottie

SBATISTE - Muhammad Ali

OWNOLAN - Owen Nolan

AUSTIN - Ray Austin

STEVEF - Steve Francis

NELSON - Trevor Nelson

Signature Moves

As do most people, they don't read the manual... To perform a boxer's signature move, press Trinagle Circle, in career mode, you must earn one after so many practice sessiosn

Bite opponent's ear

For some Tyson action, clench the opponent and press Triangle + Circle + X + Square

Illegal kick 

 

When your fists just arent' enough press Triangle + Circle + X + Square.