 On August 14, 2015 the Boston Red Sox signed Marrero to a minor league contract.He started 2016 with the Triple-A Pawtucket Red Sox, where he won the International League Home Run Derby, and also earned MVP honors in the league's 4–2 victory over the Pacific Coast League at the Triple-A All-Star Game.He played the 2015 and 2016 seasons with his cousin, infielder Deven Marrero.