Lefty pitching

On average how hard do leftys throw at D1, at D2, and at D3

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I think this is a very difficult question to answer. There are too many variables that go into this question. Things like projectability, grades, command of pitches, coachability etc. etc.

in my first season of seeing division I pitching last year i saw lefties throw anywhere from 78-95.

Hope that helps.