A month into the season, the Miami Marlins’ polarizing pitch-calling system has received both commendation and criticism. But it has gone mostly to plan. From the dugout, assistant pitching coach Rob Marcello uses his fingers to relay his desired pitch type and location to the catcher, who checks his wristband for the corresponding number before transmitting the selection to the pitcher via PitchCom. The premise is simple: Pitching coaches do most of the preparation leading into a series and have more information at their disposal than the players on the field — literally on a card in their ha...
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