To unlock these players type these names in at the career mode.

Code      Result            
DEFIAGBN  -David Defiagbon 
SBATISTE  -Muhammad Ali 
AUSTIN    -Ray Austin 
HATCHER   -Charles Hatcher 
BOSTICE   -David Bostice 
ZITO      -Chuck Zito 
JRSEAU    -Junior Seau 
MRBARRY   -Barry Sanders 
OSUNA     -Bernando Osuna 
OWNOLAN   -Owen Nolan 
NELSON    -Trevor Nelson 
MECCA     -Ashy Knucks 
JGIAMBI   -Jason Giambi 
STEVEF    -Steve Francis 
DEMART    -David DeMartini 
JBOTTI    -John Botti 
BAILEY    -Joe Mesi

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Hints

My Specialty:
To use your specialty punch, get close to your opponent and press Triangle + Circle at the same time.

Thanks to Revolution readers Eric Guzman and m22intexas!