Education
Jackson attended Rancho Bernardo High School in San Diego County, California.
Jackson attended Rancho Bernardo High School in San Diego County, California.
He was drafted by the Mariners in the first round of the 2014 Major League Baseball Draft. In 2012, he played in the Under Armour All-America Game at Wrigley Field. As a junior, Jackson was ranked by MaxPreps as the best high school prospect for the 2014 class and was their Junior of the Year.
Jackson verbally committed to the University of Oregon in March 2013.
As a senior he tied John Drennen for most career home runs in the San Diego section with 47. Jackson was highly touted as the best hitter in the 2014 Major League Baseball Draft.
He was selected sixth overall in the first round of the draft by the Seattle Mariners. He was signed by the Mariners on June 23.
Jackson began the 2015 season with the Clinton LumberKings of the Class A Midwest League, where he struggled, batting.157 with no home runs and 35 strikeouts in 28 games.
The Mariners returned Jackson to extended spring training in May, and assigned him to the Everett AquaSox of the Class A-Short Season Northwest League when their season began in June.