All Working 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].

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

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

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.

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.