Red Sox promoting No. 1 prospect Marcelo Mayer to Double-A
Boston Red Sox Promoting Top Prospect to Next Level - Fastball
Red Sox No. 1 Prospect Marcelo Mayer Promoted to Portland
Red Sox Rumors: Top Prospect Marcelo Mayer Promoted To Double-A
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Red Sox June all-minors team: Ceddanne Rafaela up to WooSox after torrid stretch - The Athletic
NESN on Twitter: Red Sox top prospect Marcelo Mayer was happy to be reconnected with some familiar faces when promoted to Double-A Portland. / Twitter
