Education
Olson attended University High School in Spokane Valley, Washington.
Olson attended University High School in Spokane Valley, Washington.
He made his Major League Baseball (MLB) debut with the Seattle Mariners in 2015. He enrolled at Gonzaga University and pitched for the Gonzaga Bulldogs baseball team He pitched for the Bulldogs as a freshman in 2009, but took a redshirt in 2010 when he suffered a shoulder subluxation.
In 2012, his junior year, he was added to the Bulldogs" starting rotation, and pitched 110 innings.
The Oakland Athletics selected Olson in the 17th round of the 2012 Major League Baseball draft. Olson did not sign with Oakland, returning to Gonzaga for his senior year.
He was named the West Coast Conference"s Pitcher of the Year. The Seattle Mariners selected Olson in the seventh round, with the 207th overall selection, of the 2013 MLB Draft.
He signed with the Mariners and began his professional career with the Everett Aquasox of the Class A-Short Season Northwest League.
He started the 2014 season with the High Desert Mavericks of the Class A-Advanced California League, and was promoted to the Jackson Generals of the Class Associate of Arts Southern League during the season. The Mariners invited Olson to spring training in 2015. He made the Mariners" Opening Day roster.
He went on the disabled list with a knee injury in May.
He was activated and optioned to the Tacoma Rainiers of the Class American Automobile Association Pacific Coast League on June 2.