F4 was the defensive player. In NCAA it is called the TP. The DP bats for them and also can play defense for the other players. If they play defense for the TP it is a substitution. Thats why it is a DP and not a DH. I high school (in my state) the defensive player is called a FLEX, and in ASA they are called the DEFO. It is pretty much the same rule however.
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ASA,NCAA,FED,NAFA
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