Díaz attended Roberto Clemente High School in Chicago where he was honored as an Illinois All-State baseball player each of his four years there.

As a high schooler, he was invited to dinner by fellow Dominican and star Chicago Cubs outfielder Sammy Sosa.

Shortly thereafter, he signed a minor league contract with the Seattle Mariners and was assigned to their Triple-A affiliate, the Tacoma Rainiers.

In 2012, Díaz signed a one-year deal worth $200,000 (15m Yen) and a $50,000 signing bonus (3.9mil Yen) to play professionally in Japan for the Chunichi Dragons In 2013, Diaz played for the Bridgeport Bluefish of the Atlantic League of Professional Baseball, and batted .172 (20-116) with 2 home runs and 46 strikeouts.

In the summer of 2014, Diaz played in the Westchester-Rockland Wood Bat League and hit .340 (16-47) during the regular season while playing in only 17 games, and .500 (10-20) with two homeruns in 6 postseason games Diaz signed with the Grand Prairie AirHogs of the American Association of Independent Professional Baseball for the 2015 season.