SALT LAKE CITY — Stevenson Sylvester stuffed Connor Dietz on a fourth-down quarterback keeper to preserve No. 18 Utah's 23-16 overtime victory over Air Force on Saturday.

On fourth-and-2 at the 7, Dietz pulled the ball from the fullback and tried the same play that had worked all game long. This time, Sylvester appeared in the running lane and brought Dietz down for no gain.

Dietz rolled on the ground in misery as the Utah players flooded the field from the sideline to celebrate the Utes' fourth straight win.

Dietz rushed 28 times for 98 yards, but the Falcons (4-5, 3-3 Mountain West) lost for the sixth time in seven games in the hard-fought series against Utah (7-1, 4-0), with many games coming down to the last play.