Knockout Kings 2001 Codes -

Unlock Muhammad Ali:
In career mode, create a boxer and submit the name SBATISTE.

Unlock Owen Nolan:
In career mode, create a boxer and submit the name OWNOLAN.
 

Unlock Ray Austin:
In career mode, create a boxer and submit the name AUSTIN.
 

Unlock Steve Francis:
In career mode, create a boxer and submit the name STEVEF.
 

Unlock Trevor Nelson:
In career mode, create a boxer and submit the name NELSON.

Unlock Ashy Knucks:
In career mode, create a boxer and submit the name MECCA.
 

Unlock Barry Sanders:
In career mode, create a boxer and submit the name MRBARRY.
 

Unlock Bernardo Osuna:
In career mode, create a boxer and submit the name OSUNA.
 

Unlock Chuck Zito:
In career mode, create a boxer and submit the name ZITO.
 

Unlock Charles Hatcher:
In career mode, create a boxer and submit the name HATCHER.
 

Unlock David Bostice:
In career mode, create a boxer and submit the name BOSTICE.
 

Unlock David Defiagbon:
In career mode, create a boxer and submit the name DEFIAGBN.
 

Unlock David DeMartini:
In career mode, create a boxer and submit the name DEMART.
 

Unlock Jason Giambi:
In career mode, create a boxer and submit the name JGIAMBI.
 

Unlock Joe Mesi:
In career mode, create a boxer and submit the name BAILEY.
 

Unlock John Botti:
In career mode, create a boxer and submit the name JBOTTI.
 

Unlock Junior Seau:
In career mode, create a boxer and submit the name JRSEAU.
 

Bite opponents ear:
Push + to clinch your opponent. Then, Push + + + .

Illegal kick:
Push + + + during a match to illegally kick your opponent in the midsection.

Illegal head butt:
Push + and push during a match.

Illegal low punch:
Push + and push during a match.

Illegal kidney punch:
Push + and Push during a match.

Illegal elbow:
Push + and push during a match.