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*AROLDIS CHAPMAN*
*105.1 MPH*
(24 SEPTEMBER 2010)
(maybe as fast as 106 mph)

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On September 24, 2010, against the San Diego Padres, Chapman was clocked at 105.1 mph (169.1 km/h), according to PITCHf/x, the fastest pitch ever recorded in Major League Baseball.[68]
On July 19, 2016, Chapman matched his previous record of 105.1 mph with a ball to Baltimore’s J. J. Hardy.[69]
That record was tied by Jordan Hicks on May 20, 2018

On April 18, 2011, Chapman threw a pitch to Pittsburgh’s Andrew McCutchen that the scoreboard at Great American Ball Park clocked at 106 mph (170.6 km/h), but the box on Fox Sports Ohio’s broadcast listed it at 105 mph (169 km/h) and the PITCHf/x system calculated a release speed of 102.4 mph (164.8 km/h).
The disparity between these speeds has been widely discussed and questioned
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