Deven Sommer Marrero (born August 25, 1990) is an American professional baseball infielder for the Boston Red Sox of Major League Baseball (MLB).
Marrero graduated from American Heritage School, a private school in Plantation, Florida. As a freshman in 2010, he hit a .397 batting average with 42 runs batted in to earn a spot on the Collegiate Baseball First Team Freshman All-American squad as well as Pac-12 All-Conference honorable mention honors. He really took off in the 2011 season, in which his sterling defense led him to be named the Pac-10 Defensive Player of the Year and earned a spot on the All-Pac-10's first team, all while hitting a .313 average. Marrero was selected 24th overall by the Red Sox in the first round of the 2012 MLB draft out of Arizona State University.
Marrero began his professional career in 2012 with Single-A Lowell Spinners of the New York–Penn League, where he posted a .268/.358/.374 slash line with 19 extra-base hits, 45 runs and 24 stolen bases in 64 games.
Entering 2013, Marrero is ranked as the best 11th prospect in the Red Sox minor league system. He was invited to spring training, to become the first Red Sox position player to attend the training camp spring training the season following the year he was drafted since Scott Hatteberg in 1991 and 1992. He began 2013 with the Salem Red Sox and was promoted to the AA Portland Sea Dogs after hitting .256 over 85 games.
Marrero began the 2014 season with Portland and, after hitting .291 over 68 games, he was promoted to the AAA Pawtucket Red Sox. He hit .210 over 50 games with Pawtucket. Following the 2014 season, Marrero was named the Red Sox Minor League Defensive Player of the Year.
The Red Sox promoted Marrero to the major leagues on June 25, 2015.
Marrero made his major league debut against the Tampa Bay Rays on June 28 at second base after Mike Napoli was ejected in the second inning.
Marrero hit his first major league home run off of Caleb Cotham of the New York Yankees on September 28, 2015.