After attending Sierra Canyon School, Martin committed to Arizona State. As a freshman, Martin averaged 9.6 points, 3.0 rebounds, and 2.9 assists per game and earned Sixth-Man of the Year honors in the Pac-12. He scored 21 points in an upset of Kansas.[2] As a sophomore, Martin struggled with injuries which forced him to miss a few games but still averaged 12.9 points, 5.0 assists and 3.2 rebounds per game.