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MLB reportedly used two different baseballs in games in 2021
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MLB: With new baseball cutting offense, which hitters are in trouble?
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MLB labor dispute: Baseball appears headed for first work stoppage in decades
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News emerges MLB used 2 types of baseballs in 2021 as labor deadline passes : NPR
Rawlings puts the Ball in Baseball | Think Blue LA
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MLB leans on longtime mud supplier, not Rawlings, to coat balls - Sports Illustrated
MLB will change its baseballs after record home run rates | The Japan Times
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Here are the new MLB rules for the 2022 season | RSN
