I don't mean to disrespect whoever your physics or biophsysics professor was in college, but you are dillusional if you do not think there is any torque during a baseball swing...
go back and inform your professor that torque is nothing more than a measure of how much a force acting on an object causes that "object" to rotate.
The "object" will rotate around an axis, which is called the pivot point, which is the baseball player's spine.
The distance from the player's spine to the point where the force acts is called the moment arm.
Can you figure out what the "moment arm" is?
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and we never even got to talk about the torque in the players hands... (hint, hint - gets the batter's hands palm up/palm down)... unless you have another theory on how that happens....??