A freshman at Grand Canyon University in Phoenix, Andrew was 9-3 with a 2.38 ERA and had 87 strikeouts in 94.2 innings. He was named the PacWest Conference Freshman of the Year, a second-team all-star, and an honorable-mention National Collegiate Baseball Writers Association West Region all-star.
A graduate of Arcadia High School in Phoenix, Andrew was a second-team All-Division II selection as a senior in 2012. He was the 2011 East Sky Region Pitcher of the Year, when he went 8-2 with a 1.74 ERA in 12 games. He was also a member of the 2011 Junior Sunbelt team.