First-round pick Marcelo Mayer signs with Red Sox, gets a Fenway welcome - The Boston Globe
Top Red Sox pick Marcelo Mayer homers in second straight
2021 MLB Draft guide: How to watch, first-round order, and when the Red Sox pick - The Boston Globe
Boston Red Sox select 'superstar' shortstop in 2021 MLB Draft
MLB Draft 2021: Marcelo Mayer and Five Other Prospects to Watch - The New York Times
2021 MLB Draft: Marcelo Mayer headlines eight high school shortstops taken in first round
Boston Red Sox select Marcelo Mayer from Eastlake HS with the 4th pick of the 2021 MLB Draft
Boston Red Sox Top 51 Prospects
List of Boston Red Sox first-round draft picks - Wikipedia