For the first time this season, South Fayette did not win a game by the 35-point mercy rule.
Nevertheless, the No. 2 seed Lions (11-0) remain undefeated after holding off Beaver Falls (8-3), 35-21, in the WPIAL quarterfinals Friday at Moon.
Dan Stratton's 4-yard touchdown run and his subsequent 2-point conversion run enabled Beaver Falls to forge a 14-14 deadlock at halftime.
The Lions took a 21-14 lead when Dylan Nock returned an interception 8 yards for a touchdown early in the third quarter.
Beaver Falls responded with a 40-yard touchdown run by Stratton and extra-point kick by Elijah Cottrill to knot the score, 21-21, midway in the third quarter.
South Fayette eventually pulled away when Brett Brumbaugh threw two touchdown passes in the game's later stages.
The decisive score came when Brumbaugh found Zach Challingsworth for 57 yards.
Conner Beck caught a 44-yard pass from Brumbaugh for an insurance touchdown.
Brumbaugh, the top passer in the WPIAL, completed 19 of 31 attempts for 330 yards and three touchdowns.
However, Brumbaugh threw three interceptions and the Lions committed five turnovers.
Brumbaugh has passed for 2,468 yards and 35 touchdowns this season.
The No. 1 Quips (11-0) had no trouble eliminating the Vikings (8-3) at Peters Township. Aliquippa's Terry Swanson rushed for 113 yards on six carries. Swanson scored on an 88-yard run in the first quarter. Dravon Henry scored three touchdowns on runs of one, 24 and 46 yards. Aliquippa led at halftime, 36-0. Mount Pleasant running back Tyler Mellors, who rushed for 1,241 yards in the regular season, was held to 64 yards on 17 carries for a 3.7 yard average. Mellors was averaging 9.1 yards per carry going into the quarterfinals. The Quips rolled up 393 yards offense, including 322 on the ground. Aliquippa also recovered two Mount Pleasant fumbles. Devon Walker returned one of the fumbles 30 yards for a touchdown.
The No. 4 Jayhawks (10-1) are one step from returning to the WPIAL title game after a convincing win against the Bobcats (9-2) at Hampton. Jordan Edmunds opened the game with an 80-yard kickoff return for a touchdown. Edmunds also scored on a 5-yard run. Shavonta Craft added three touchdowns and 111 yards rushing for Jeannette. Craft scored on runs of 24 and 30 yards. Jeannette only attempted three passes, and its only completion was for minus 2 yards, but finished with 272 net yards on the ground.