Umpires Nate Tomlinson and Dan Merzel will make their postseason debuts in the Division Series, with Tomlinson working Seattle's matchup against Detroit and Merzel assigned to Philadelphia's meeting with the Los Angeles Dodgers.

Tomlinson, 35, worked his first big league game in 2020 and was hired as a fulltime member of the major league staff in June 2024. Merzel, 38, also made his big league debut in 2020 and was hired to the fulltime staff this year.

Both will work right field for Game 1s on Saturday, meaning they won't have a home plate assignment in the best-of-five series.

Lance Barksdale, Dan Bellino, Alan Porter and Mark Wegner will be crew chiefs, Major League Baseball said Friday. Wegner will be working his 11th Division Series, Bellino his ninth, Barksdale his eighth and Port

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