Julio Daniel Martinez (born August 21, 1987) is an American professional baseball outfielder and designated hitter for the Los Angeles Dodgers of Major League Baseball (MLB). He has previously played in MLB for the Houston Astros, Detroit Tigers, Arizona Diamondbacks, and Boston Red Sox. 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).
A native of Miami, Florida, Martinez attended Nova Southeastern University (NSU) before the Astros selected him in the 20th round with the 611th pick in the 2009 amateur draft. He is the first player drafted from NSU to play in the major leagues. He is a six-time MLB All-Star selection and a three-time Silver Slugger Award winner, as well as the only player to earn the latter honor twice in the same season.
On September 4, 2017, Martinez became the 18th player in MLB history to hit four home runs in a single game, doing so versus the Los Angeles Dodgers. During the Red Sox' 2018 World Series run, he won the American League (AL) Hank Aaron Award as the league's top offensive performer, leading the league in RBIs, while placing second in batting average and home runs. He also won the 2018 Players Choice Award for Player of the Year.