Red Sox No. 1 Prospect Marcelo Mayer Promoted to Portland
BREAKING* TOP RED SOX PROSPECT PROMOTED!!
Marcelo Mayer Has Been Promoted to AA Portland
Red Sox top prospect Marcelo Mayer on fire for High-A Greenville
Red Sox shut down top prospect Marcelo Mayer due to shoulder
Red Sox prospect Marcelo Mayer opens up about season-ending
Boston Red Sox Top 30 Prospects For Dynasty - FantraxHQ
Red Sox Prospects Report: June - Over the Monster
Marcelo Mayer, the Red Sox' top prospect, already looks destined