Expanded M.L.B. Playoffs Leads to More Rookies Making Postseason Debuts - The New York Times

Why MLB teams are calling up prospects: Rookie day limit, expanded rosters leading to promotions

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Chicago Cubs - Wikipedia

Evan Carter, Corbin Carroll and MLB's precocious rookie class unfazed by pressure-packed playoffs - Newsday

MLB playoff expansion: Proposal includes more teams and new wrinkle on matchups, report says

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