I saw Vlad Guerrero hit one this week and also Christian Walker hit one against the Mets. To do what you are talking is possible, but it requires a different move than a regular swing. You really have to bring your hands in front of your body and keep the barrel of the bat back. I haven't seen Clark swing like that once. He gets the barrel out in front and the only place that ball can go is into the first base stands. The picture below is the Walker home run on a very good pitch inside. See how his hands are in front of his open body, but the barrel of the bat is still back. There was a drill that Gene Clines showed me where you stand facing a fence where you can reach out and touch the fence. You then swing the bat without hitting the fence. It gives you the feel of doing that type of hitting.
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I was more in the Mike Schmidt mindset. I eliminated the inside pitch all together by standing way off the plate. I did not have to make a different move on any pitch that was over the plate. I found it did two things. I eliminated getting jammed and was able to allow the ball to get deeper on me. I also found that the umpire rarely called that outside pitch on the black because it looked too far away from me. My perfect swing was a line drive to right center field. I could hit balls left of third but never really hit them into the third base side stands.
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I really believe this would help him so much. Clark's last AB today he watched 3 fastballs and never swung. He swung at the one bad pitch. I just don't understand how you get fooled by a fastball. And he is not the only MSU batter to do that.