Pitchers catch a bad break at elevation, lose movement on their curveball
The effect of air on baseball pitches
January, 2012
Baseball's 106mph barrier: have pitchers reached the limits of their velocity?, MLB
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
The designated hitter will soon be the way for all of MLB
Statcast data: The top differences in actual and perceived velocity - Beyond the Box Score
Why It's Almost Impossible for Fastballs to Get Any Faster
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Baseball's 106mph barrier: have pitchers reached the limits of their velocity?, MLB