baseball america – Blogging the Red Sox
Boston Red Sox minor league players - Wikipedia
Top Red Sox prospect Marcelo Mayer collects four hits
Red Sox's Marcelo Mayer On Pace To Become No. 1 Prospect In MLB Next Season - Sports Illustrated Inside The Red Sox
Boston Red Sox 2023 Top 30 Prospects — Prospects Live
Red Sox prospect Ceddanne Rafaela has one last hurdle to clear
Marcelo Mayer is the biggest Red Sox prospect to hit Portland in a decade. Catch him while you can. – The Portland Phoenix
Red Sox prospect Marcelo Mayer drives in career-high 5 runs
Red Sox promote top prospect Marcelo Mayer to High A Greenville - The Boston Globe
4 Red Sox prospects named to Baseball America's top 100 list
Sea Dogs' Marcelo Mayer hits first Double-A homer
2021 Leaf Draft #41 Marcelo Mayer RC Rookie Card XRC Draft/Prospect Baseball Card in Raw (NM or Better) Condition : Collectibles & Fine Art