Prospect Report: Red Sox's Mayer Caps a Great Week — College Baseball, MLB Draft, Prospects - Baseball America
Baseball America — College Baseball, MLB Draft, Prospects - Baseball America
2019 MLB draft -- Picks and analysis - ESPN
Could Red Sox take exciting shortstop prospect Marcelo Mayer with No. 4 pick in 2021 MLB Draft? – Blogging the Red Sox
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Marcelo Mayer wasn't supposed to be there for the Red Sox at No. 4, but the MLB Draft had other plans - The Boston Globe
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Baseball America — College Baseball, MLB Draft, Prospects - Baseball America
