Four New Experimental Rules to be in Play for 2021 MiLB Season - Pinstriped Prospects
The Rundown: Opening Day Arrives, No Extension for Happ, Torrens Makes Team, League Announces Historic MiLB CBA - Cubs Insider
Minor league hitters on automatic pitch clock strikes: “unnecessary chaos” - Royals Review
Pioneer League installs new rules for 2021
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The Yankees Have (Good) Problem and It's About to Get Worse - Pinstriped Prospects
MLB testing three new rules in Atlantic League, including designated pinch runner
MLB will use experimental rule changes in 2021 minor-league season: Defensive shift limits, robot umps, more
MLB, Atlantic League announce rule experiments for 2023
MLB, Atlantic League announce rule experiments for 2023
MLB will test some experimental rules in the minor leagues in 2022 - Bleed Cubbie Blue
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