San Diegans Marcelo Mayer, Spencer Jones focus on the present as they head to MLB Futures Games - The San Diego Union-Tribune
2021 MLB Draft: Red Sox first-round pick Marcelo Mayer quickly ditches Yankees allegiance
Where are the Top Class of 2021 Prospects Now? - ITG Next
Four Red Sox minor-leaguers among Baseball America's Top 100 prospects rankings - The Boston Globe
Red Sox Marcelo Mayer or Yankees Anthony Volpe
MLB Draft 2021: Marcelo Mayer and Five Other Prospects to Watch - The New York Times
2021 MLB Draft - Top 500 Prospects — Prospects Live
Boston Red Sox Top Prospects: Marcelo Mayer in the top 100 and Jud Fabian's signing status - Over the Monster
Could Red Sox take exciting shortstop prospect Marcelo Mayer with No. 4 pick in 2021 MLB Draft? – Blogging the Red Sox