Please note VGF's cheat codes have relocated to the main page.
All-Star Baseball 2003
Hit Home Runs (as a left-handed batter)
Press R + Left, R + Down before the pitch.
(Thanks to elliot188@hotmail.com)
Hit Home Runs (as a right-handed batter)
Press R + Right, R + Down before the pitch.
(Thanks to elliot188@hotmail.com)
Hit the Ball Harder
Press Select while pitcher is in his wind-up.
(Thanks to elliot188@hotmail.com)