Taylor Kelly passed for four touchdowns in his final home game, D. J. Foster rushed for three and No. 13 Arizona State converted all five Washington State turnovers into touchdowns to beat the Cougars 52-31 on Saturday.
Arizona State's Cameron Smith caught six passes for a career-best 131 yards and two touchdowns for the Sun Devils (9-2, 6-2 Pac-12), who can still win the Pac-12 South title, with some help.
Redshirt freshman Luke Falk of Washington State (3-8, 2-6), passed for 601 yards but was intercepted four times and fumbled the ball away once. Vince Mayle caught 15 for 265 yards.
The Sun Devils scored 31 straight points in the second half before the Cougars managed a touchdown with 24 seconds to play.