PULLMAN, Wash. -- Taylor Kelly threw five touchdown passes and ran for two more scores as Arizona State beat Washington State 55-21 on Thursday night.
Kelly threw for 275 yards and rushed for 66 to help the Sun Devils (6-2, 4-1 Pac-12) qualify for a bowl and win their first road game of the season after two losses.
Connor Halliday had 300 yards passing for Washington State (4-5, 2-4), which has lost four of five. Halliday, who set an FBS record in his previous game with 89 pass attempts in a loss to BCS No. 2 Oregon, was 29-of-54 with two touchdowns.
Marion Grice ran for 94 yards as ASU scored at least 50 points for the fifth time this season. Kelly completed 22 of 31 passes and was intercepted once.
Arizona State scored three times in the first quarter, thanks in part to great field position, and three more times in the second to build a lead the Cougars could not overcome.
Kelly marched the Sun Devils 67 yards on their first possession, scoring on a bootleg from 7 yards out.
Washington State went three-and-out on its first three possessions. After the Sun Devils took over on the Cougars' 36 following a short punt, Grice ran the ball five times to get down to the 6. Kelly bootlegged into the end zone for a second time to give ASU a 14-0 lead.
Washington State's Gabe Marks fumbled after an 18-yard reception, and Robert Nelson recovered to give Arizona State the ball on the WSU 39. Kelly fired an 11-yard touchdown pass to Jaelen Strong all alone in the end zone for a 21-0 cushion with 3:20 left in the first quarter.
Marks redeemed himself on the first play of the second, taking a short pass from Halliday and weaving through the ASU defense for a 34-yard touchdown.
Arizona State's Deantre Lewis fumbled on the next series, and WSU's Ioane Gauta recovered. But the Cougars had to punt and Kelly moved the Sun Devils 62 yards, finishing with a 7-yard touchdown pass to D.J. Foster for a 28-7 lead.
After another three-and-out for WSU, Kelly fired a 51-yard touchdown pass to Richard Smith on the next play from scrimmage.
The Cougars turned the ball over on downs, and five plays later Kelly hit Chris Coyle with an 8-yard touchdown pass to make it 42-7 with 1:40 left in the first half. Grice's 32-yard reception was the big play on the drive.
Washington State replied with its best drive. The Cougars marched 75 yards and Rickey Galvin caught a 15-yard touchdown pass from Halliday to cut ASU's advantage to 42-14 at halftime.
Washington State scored first in the second half, on a 4-yard run by Jeremiah Laufasa to make it 42-21. The Sun Devils replied with Kelly's 23-yard touchdown pass to Foster.
Zane Gonzalez added a pair of field goals for Arizona State in the fourth.
The Sun Devils lead the series 25-13-2, having won nine of the past 10 games.
Both teams were coming off bye weeks.