PULLMAN, Wash. (AP) Dylan Riley rushed for 128 yards and two touchdowns as No. 21 Boise State pulled away from Washington State in the fourth quarter for a 31-10 victory on Saturday.

Riley scored on runs of 33 and 72 yards for the Broncos (6-1, 3-0 Pac-12), who have won six straight after a season-opening loss on the road to Oregon. With the win, Boise State became bowl eligible and pulled even with Oregon State for first in the Pac-12.

It was the fifth straight loss for the Cougars (1-7, 0-4), who were eliminated from possible bowl contention with the loss. For the second straight week Washington State started quarterback Owen Eshelman, who threw for 191 yards and was intercepted once.

Sire Gaines barreled past Washington State's defenders for a 9-yard touchdown run in the opening quarter. The scoring play was set up by Maddux Madsen's deep 33-yard pass to freshman Rasean Jones for the first down.

Late in the first half, Washington State went on a 16-play, 73-yard drive, capped by Kirby Vorhees' 1-yard touchdown run that was originally called just short but awarded after review.

With less than a minute left the Boise State marched down the field and took a 10-7 lead on a 28-yard field goal from Canaan Moore.

Jack Stevens made a 47-yard field goal for Washington State midway through the third quarter to tie it at 10-10.

Madsen found a wide open Cam Bates with a 6-yard scoring pass early in the fourth quarter to give the Broncos a 17-10 lead.

Boen Phelps intercepted Eshelman on Washington State's 35, and the Broncos capitalized with Riley's 33-yard touchdown dash to extend the lead.

Riley, who gained just 18 yards in the first half, broke free for a 72-yard touchdown run that put the Broncos up 31-10. It was his fourth dash of more than 70 yards this season.

Boise State defensive back Roman Tillmon was ejected late in the game for targeting on Eshelman.

Madsen threw for 149 yards and a touchdown. He has yet to throw an interception this season.

Boise State: visits Texas State next Saturday

Washington State: visits San Diego State next Saturday.

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