May Farm Report: Red Sox promote Shane Drohan, Marcelo Mayer
Detroit Tigers draft watch: Marcelo Mayer's swing packs power
MLB Draft 2021: Red Sox select prep shortstop Marcelo Mayer with No. 4 pick
SoxProspects News: Red Sox Select Marcelo Mayer with the fourth overall pick
Marcelo Mayer continues climb in MLB's Top 100 prospect rankings
Marcelo Mayer reacts to getting drafted fourth overall by Red Sox
Red Sox: Marcelo Mayer surprisingly falls to No. 4 in MLB Draft
Marcelo Mayer is the biggest Red Sox prospect to hit Portland in a decade. Catch him while you can. – The Portland Phoenix
Marcelo Mayer of Eastlake High taken fourth in MLB Draft - The San Diego Union-Tribune
Red Sox draft pick Mikey Romero has close bond with Marcelo Mayer – NBC Sports Boston
2021 MLB Draft: Red Sox select No. 1-ranked prospect Mayer, Local Sports
Red Sox: Marcelo Mayer's prospect ranking shows he was the right draft choice
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
Red Sox to promote top prospect Marcelo Mayer to Double-A Portland – Blogging the Red Sox
On the Clock with the 4th Pick Boston Red Sox 2021 MLB Draft