MLB Cheats - PSP

Big ball
Pause game play, then press [Up], [Right], [Down], [Left], [Right], [Down], [Left], [Up].

Faster players
Pause game play, then press [Left]x3, [Up], [Right]x3, [Down].

Faster pitch speed
Pause game play, then press [Up]x2, [Left], [Right], [Left], [Right], [Up]x2.

Slower players
Pause game play, then press [Right]x3, [Up], [Left]x3, [Down].

Big heads
Pause game play, then press [Left], [Right], [Up]x2, [Left], [Right], [Up]x2.

Small heads
Pause game play, then press [Left], [Right], [Down]x2, [Left], [Right], [Down]x2.

Game developer starters
Pause game play, then press [Left], [Down], [Up], [Right], [Left], [Down], [Up], [Right].

Disable sound effects
Pause game play, then press [Up]x2, [Down]x2, [Left], [Right], [Left], [Right].

Good hits
If you guess a four seam fastball every time you will increase your chances of hitting the ball, and hit the ball further.

Easy home runs
Start season mode. Press Start during a game and go to the options. Go to "User Game Tuning" then increase your contact and power until it is a full bar. You will now be able to hit a home run with almost every at bat.

Quick win
Score a run then press Start. Go to "Fast Forward" and select "End Of Game". You will win.

Inside the park home run
When you are at bat, if the ball goes to the entrance of a dug out, the opposing team will try to pick it up but will not be able to get to it. Keep running until you get to home plate.