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Baseball's 106mph barrier: have pitchers reached the limits of their velocity?, MLB
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With the 100mph fastball such an everyday occurrence in Major League Baseball, what is the ultimate top pitch speed given human throwing abilities? - Quora
Did Nolan Ryan actually throw 108 MPH? I don't understand how they used to measure speed and how his fastball would measure today. - Quora
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Solved Professional baseball pitchers can deliver a pitch