Marcelo Mayer is the biggest Red Sox prospect to hit Portland in a

Boston Red Sox prospect watch: Marcelo Mayer leads pack of promotions

Here's where MLB ranks the top Red Sox prospects

Sea Dogs prospect Mayer, 20, focused on pitch selection -- and lobster rolls, Fisher Cats

Trevor Story praised Red Sox prospect Marcelo Mayer

Shortstop Marcelo Mayer makes debut at Hadlock Field in 6-2 Sea Dogs win

San Diegans Marcelo Mayer, Spencer Jones focus on the present as they head to MLB Futures Games - The San Diego Union-Tribune

Red Sox promote top prospect Marcelo Mayer to Portland Sea Dogs

How did Red Sox top prospect Marcelo Mayer fare in first full pro season? – Blogging the Red Sox

Top Red Sox prospect Marcelo Mayer promoted to Double A after blistering May - The Athletic