All games at 7:30 p.m. today.
1-Aliquippa (10-0) vs. 8-Quaker Valley (8-2)
At Moon -- Led by a stingy defense and a two-way star player in Dravon Henry, the Quips have gotten off to an excellent start in their quest of claiming a third consecutive WPIAL championship, winning their 10 games by an average of 38.4 points. The quarterfinal appearance marks the furthest the Quakers have made it in the postseason since 1999.
4-Mount Pleasant (10-0) vs. 12-Beaver (7-3)
At Plum -- The Vikings are 10-0, matching a similar start in 2009. Senior Tyler Mellors has rushed for 1,592 yards this season. But as impressive as he and Mount Pleasant have been in 2013, it has yet to face a passer quite like Alex Rowse of the Bobcats, who has thrown for 2,445 yards, 37 touchdowns and just four interceptions this season.
2-South Fayette (10-0) vs. 10-Seton-LaSalle (8-2)
At Peters Township -- Junior Brett Brumbaugh has thrown for 2,066 yards and 26 touchdowns for the Lions this season, but he's far from the only accomplished passer in this game -- Rebels quarterback Tyler Perone has passed for 2,166 yards and 23 touchdowns. In the past two weeks alone, he has thrown for 708 yards and eight touchdowns. South Fayette won the previous matchup between the teams this season, 45-3, on Sept. 27.
6-Beaver Falls (8-2) vs. 11-Yough (6-4)
At Canon-McMillan -- Yough erupted for a season-high 57 points in a surprising victory against third-seeded Kittanning last week, an excellent accomplishment for a program that was winless in 2010, when the team's current seniors were freshmen. Things could get even more difficult this week against a Beaver Falls team that has scored 50 points or more in three of its past five games.
➤ Statistically speaking: South Fayette has scored at least 50 points in 20 of its past 22 games, including all 10 of its victories in 2013.
➤ History lesson: Aliquippa has gotten accustomed to a certain level of postseason success, a mindset that has come for a good reason -- in each of the past six seasons, the Quips have made it at least to the WPIAL semifinals, a destination they would reach again with a victory Friday against Quaker Valley.