Unlockables:

All Venues
Use NEWVIEW as a first name in Create Champ.

Judge Jab
Defeat Joe Frazier with Ali

Lethal Uppercuts
Win a classic fight with Roberto Duran

Mooth Style
Beat Muhammed Ali in a challenge event

Madison Square Garden
Win a bout at Madison Square Garden

Ko Rey Mo
Defeat him in career mode

Sinister Cross
Win a Classic fight with Roy Jones Jr.

Textbook
Win a Classic fight with De La Hoya.

ESPN Classic Fight
Win Under Armour Bout in career mode.