The independent Atlantic League became the first American professional league to let a computer call balls and strikes at its All-Star Game on July 10. Plate umpire Brian deBrauwere wore an earpiece connected to an iPhone in his pocket and relayed the call upon receiving it from a TrackMan computer system that uses Doppler radar. ADADThe Atlantic League experimented with the computer system during the second half of its season, and the Arizona Fall League of top prospects used it for a few dozen games this year at Salt River Fields. MLB has discussed installing the system at the Class A Florida State League for 2020. If that test goes well, the computer umps could be used at Triple-A in 2021 as bugs are dealt with prior to a big league callup.

Source: Washington Post December 22, 2019 00:17 UTC