Marcelo Mayer SS Scouting Report: 2021 MLB Draft • Prospects Worldwide
Red Sox draft top high school shortstop Marcelo Mayer with No. 4 pick
2023 Top 100 Prospects
2021 MLB DRAFT SLEEPERS; Alex Mooney, Jaden Hill and more
2021 MLB Draft: Red Sox first-round pick Marcelo Mayer quickly ditches Yankees allegiance
2021 MLB Draft - Top 600 Prospects — Prospects Live
Marcelo Mayer SS Scouting Report: 2021 MLB Draft • Prospects Worldwide
2021 MLB Draft Scouting Report: SS Marcelo Mayer - Lookout Landing
2021 MLB Draft - Top 600 Prospects — Prospects Live
2021 Draft Odds & Ends
2021 MLB Draft - Top 600 Prospects — Prospects Live
MLB Draft 2021: Marcelo Mayer and Five Other Prospects to Watch - The New York Times
2021 MLB Draft Rankings • Prospects Worldwide
2021 MLB Draft - Top 600 Prospects — Prospects Live
2021 MLB Draft - Top 600 Prospects — Prospects Live