Major League Baseball 2K7 Cheats

In-Game 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:

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

Daisuke Matzusaka
The Red Sox pitcher Daisuke Matzusaka is in the game, though his name doesn't appear. He's known on the Red Sox roster as Dennis Miles (as he opted not to have his name appear in the game). This can be changed if you so desire.