Julio Daniel Martinez is an American professional baseball outfielder and designated hitter for the New York Mets of Major League Baseball (MLB). He has previously played in MLB for the Houston Astros, Detroit Tigers, Arizona Diamondbacks, Boston Red Sox, and Los Angeles Dodgers. He made his MLB debut in 2011. A right-handed thrower and batter, Martinez stands 6 feet 3 inches (1.91 m) tall and weighs 230 pounds (100 kg).

The designated hitter (DH) is a baseball player who bats in place of another position player, most commonly the pitcher.