The Boston Red Sox select Marcelo Mayer with the 4th overall pick in the 2021 MLB Draft - MLB Daily Dish
Red Sox prospect Marcelo Mayer's custom cleats at Futures Game - ESPN
MLB Draft 2021: Marcelo Mayer and Five Other Prospects to Watch - The New York Times
Top Red Sox prospect Marcelo Mayer bulks up for first minor league camp
Boston Red Sox news: Why No. 1 pick Marcelo Mayer is a special talent
Red Sox: Marcelo Mayer surprisingly falls to No. 4 in MLB Draft
Boston Red Sox minor league players - Wikipedia
Boston Red Sox Top Prospects
MLB Draft 2021: Marcelo Mayer and Five Other Prospects to Watch - The New York Times
MLB Draft Preview: Will Red Sox continue trend of drafting high school shortstops in first-round?