ChapmanAccording to MLB scouts, Chapman's fastball has been clocked as high as 105 mph (169 km/h) (during the 2010 minor league season). On September 24, 2010, against the San Diego Padres, Chapman was clocked at 105.1 mph (169.1 km/h), according to PITCHf/x, which is the fastest pitch ever recorded in Major League Baseball.