MLB Draft 2021: Marcelo Mayer and Five Other Prospects to Watch - The New York Times
2021 MLB Draft - Top 600 Prospects — Prospects Live
2021 MLB Draft — MLB Draft — Prospects Live
MLB Mock Draft 2021: Red Sox get Vandy's Jack Leiter at No. 4; Pirates take high school shortstop at No. 1
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Red Sox shut down top prospect Marcelo Mayer due to shoulder injury – NBC Sports Boston
Marcelo Mayer, Boston Red Sox 2021 first-round pick, walks three times in professional debut in FCL
Red Sox prospect Marcelo Mayer out for rest of 2023
Red Sox top prospect Marcelo Mayer has arrived in Portland
Red Sox' Marcelo Mayer vaults into top five on MLB's Top 100 Prospects list – NBC Sports Boston
Marcelo Mayer already crown jewel of Red Sox farm system, Sports
MLB Pipeline Top 150 Draft prospects
Top 10 Most Valuable: 2021 Bowman Draft Baseball – Sports Card Investor
2021 MLB Draft: Mock Draft 3.0 - Baseball Prospect Journal
Three Red Sox prospects land in Baseball America's Top 100 – NBC Sports Boston