All-Star Baseball 2003 – Gameboy Advance

All-Star Baseball 2003 - Platform: Gameboy Advance

Hit home runs:
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If you are a left handed hitter at bat, press R + Left 
gently, and R + Down gently before the pitch. 
If you are a right handed hitter at bat, press R + Right 
(gently), and R + Down (gently) before the pitch.

More powerful hits:
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When you are at bat press Select while the pitcher is winding up.