Clint Chelf threw for 292 yards and four touchdowns in his first career start, and Josh Stewart had a career-high 172 receiving yards and scored three TDs as Oklahoma State handed West Virginia its fourth straight loss, 55-34 Saturday.
Chelf, a fourth-year junior, became the third starter at quarterback for the Cowboys (6-3, 4-2 Big 12) this season. Wes Lunt sat out after suffering an apparent concussion last week against Kansas State, and his backup, J.W. Walsh, is out with a knee injury.
Geno Smith completed 36 of 54 for 364 yards and two touchdowns for the Mountaineers (5-4, 2-4), who gave up more than at least 55 points for the second time in two weeks. Stedman Bailey caught 14 of Smith's passes for 225 yards and a score.
The game marked the return of West Virginia coach Dana Holgorsen, who was the Cowboys' offensive coordinator before taking the job in Morgantown.

Meanwhile, in Birmingham...
Darrin Reaves rushed for 184 yards and two scores and Alabama-Birmingham withstood a late Marshall barrage to win 38-31 Saturday.
The Blazers (3-7, 2-4 Conference USA) led 31-7 with 5:23 left in the third quarter.
Within 2 minutes, the Thundering Herd roared back with a 10-yard TD pass from Rakeem Cato to Jazz King, followed by Kevin Grooms' 7-yard TD run and Justin Haig's 38-yard field goal with 7:18 remaining.
Reaves answered with a 17-yard TD, capping an 11-play, 80-yard drive with 2:50 left to set a single-season UAB touchdown record with 12.
Marshall (4-6, 1-5) then moved downfield quickly and efficiently, with Cato connecting with Tommy Shuler on 30- and 19-yard plays before finding Gator Hoskins for a 3-yard TD with 1:41 remaining.
UAB recovered the onside kick and ran out the clock.
The Blazers' Austin Brown threw two TD passes and Jackie Williams had a 79-yard punt return.