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Marcelo Mayer continues climb in MLB's Top 100 prospect rankings
Red Sox draft top shortstop prospect Marcelo Mayer at No. 4
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Boston Red Sox prospect Marcelo Mayer ranked No. 22, compared to
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Red Sox prospects Marcelo Mayer, Triston Casas crack ESPN's Top 50
Marcelo Mayer - Boston Red Sox Shortstop - ESPN