Pitch velocity is one of the most fascinating statistics in baseball, as documented in the 2015 documentary Fastball. Modern measurements of pitch velocity are taken as the maximum velocity achieved at any point between the pitcher's hand and home plate. However, the velocity of the ball slows down due to air resistance. Thus, we may assume this is just the instantaneous velocity when the ball leaves the pitcher's hand. In the past the velocity measurements were taken at specific distances from home plate. From 2006 to 2016, pitch velocity was recorded by the PITCHf/x system which measured velocity at a distance of 50.5 feet from home plate (10 feet from the mound) .
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