Some of baseball's most important calls now belong to the players.
Joe Martinez, MLB Vice President of On-Field Strategy, explains how MLB developed its automated ball-strike challenge system and why players, rather than managers, make the decision to challenge a call. He discusses the strategy behind the system's two retained challenges, the technology that creates personalized strike zones, and the balance between accuracy, game pace, and the human element of umpiring.
Martinez also shares what MLB has learned from the pitch clock, larger bases, and years of testing rule changes in the Minor Leagues.
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