Activate the following cheats by entering the corresponding case-sensitive codes at "My 2K7" > "Cheat Code":

CHEAT FUNCTION - CHEAT CODE
All bonuses - "Derek Jeter"
All cheats - "Black Sox"
All extras - "Game On"
Mickey Mantle card (unlocks Mickey Mantle in free agency) - "themick"
Pinch Hit Mick card (Unlocks Mickey Mantle as a pinch hitter) - "phmantle"
Big Blast card (increases chance of hitting home run for one game) - "m4murder"
Mighty Mick card (increases teams power rating 25% for one inning) - "mightymick"
Triple Crown card (increase hitting of 3, 4, 5 batters by 50% for one game) - "triplecrown"

Thouh his actual name doesn't appear, Red Sox pitcher Daisuke Matzusaka is in the game. 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.