Various cheats
     At  the  main  menu,  select  the  My 2K7 option, then choose the
"Enter  Cheat  Code"  selection.  Then  enter  the codes to unlock the
following:

Cheat code:        Result:
Derek Jeter        Unlock all bonuses.
Black Sox          Unlock all cheats.
Game On            Unlock all extras.
themick            Unlocks Mickie Mantle in free agency.
phmantle           Unlocks Mickie Mantle as a pinch hitter.
m4murder           Unlocks a card which increases chances of hitting 
                   home runs for one game.
mightymick         Unlocks a card which increases a teams power 
                   rating by 25% for one inning.
triplecrown        Unlocks a card that increases the hitting of the 3rd, 
                   4th, and 5th batter for 50% of one game.