Here is a frame-by-frame test I did in Animate 3. Critiques are really appreciated.
https://www.youtube.com/watch?v=IxVthvQeKgA&feature=youtu.be
Very nice. Have him lift his right leg before he swings the bat forward.
I like it. To make it even more effective you could add more anticipation so have him swing back even more as the ball approaches then WACK. Good job.
agree with more anticipation, just lean the body back a little before hit the ball 
good job! we want to see more animations!