Marcelo Mayer, Marcelo Mayer Profile
First-round pick Marcelo Mayer signs with Red Sox, gets a Fenway welcome - The Boston Globe
Thousand Oaks SS Maxwell Muncy - Video Scouting Report - Prospects Worldwide
MLB Draft 2021: Marcelo Mayer and Five Other Prospects to Watch - The New York Times
Tigers select Jackson Jobe with No. 3 pick in 2021 MLB Draft
Marcelo Mayer Class of 2021 - Player Profile
2021 MLB draft tracker live updates - Results for all first-round picks, order, analysis and highlights - ESPN
Could Red Sox take exciting shortstop prospect Marcelo Mayer with No. 4 pick in 2021 MLB Draft? – Blogging the Red Sox
Projecting the Top Fantasy Baseball Prospects in 2024: The Top-15 - FantraxHQ
Brendan Tuma's Midseason Top-100 Prospects (2021 Fantasy Baseball)
Marcelo Mayer SS Scouting Report: 2021 MLB Draft • Prospects Worldwide
Boston Red Sox Top Prospects: FCL Season Review - Over the Monster
2023 MLB Draft: The Top 500 Prospects - Future Stars Series
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