ASU's Cameron Marshall rushed for a touchdown that got the Sun Devils to within a point with 5:01 remaining in the game, but Thomas Weber's extra-point try was blocked by Valai.
Arizona State (2-1) was led by Steven Threet, who piled up 211 yards on 21-of-33 completions.
Kerry Taylor hauled down six passes for 71 yards and Deantre Lewis contributed 122 yards on nine carries for the Sun Devils.
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