Miles per hour be used to express the speed of delivery of a ball in sporting events such as cricket, tennis and baseball. Miles per hour Miles per hour (abbreviated mph, MPH or mi/h) is an imperial and United States customary unit of speed expressing the number of statute miles covered in one hour. It is used in the United States, United Kingdom and many Commonwealth nations, particularly in the Caribbean region. Speed limits and road traffic speeds are given in miles per hour in the following jurisdictions (elsewhere kilometers per hour are used): Road traffic speeds in other countries are indicated in
Bob Feller However, this took place in the later years of his career and the speed of the ball was measured as it crossed the plate (whereas later methods measure the speed as it leaves the pitcher's hand). With primitive equipment Feller was at one point measured at . Feller once mentioned that he was clocked at at Lincoln Park in Chicago. He also threw the second fastest pitch ever officially recorded, at , in a game in 1946 at Griffith Stadium. Feller said a 1974 test involving Nolan Ryan would be evaluated when he threw the ball rather than when it