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MLB’s New Automated Zone Sparks Highest Walk Rate Since 1950

4/23/2026

Summary

Story summary

MLB introduced the Automated Ball-Strike system with a strike-zone spanning 27%–53.5% of a batter’s height and measuring 17 inches wide.
The new zone produced a walk rate of 9.8% of plate appearances, the highest since 1950.
Arizona Diamondbacks pitcher Paul Sewald said the tighter zone favors baserunners by generating balls in play.
Miami Marlins manager Clayton McCullough projected walk rates will settle near 8% for starters and 10% for relievers.

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Story summary

MLB introduced the Automated Ball-Strike system with a strike-zone spanning 27%–53.5% of a batter’s height and measuring 17 inches wide.
The new zone produced a walk rate of 9.8% of plate appearances, the highest since 1950.
Arizona Diamondbacks pitcher Paul Sewald said the tighter zone favors baserunners by generating balls in play.
Miami Marlins manager Clayton McCullough projected walk rates will settle near 8% for starters and 10% for relievers.