Penn-Trafford handed Plum a season-opening loss.
The Warriors ended the Mustangs' season, as well.
Penn-Trafford rallied from a double-digit, second-half deficit to beat Plum, 46-43, in a WPIAL Class AAAA first-round game Friday at Hempfield.
Mt. Lebanon 63, Gateway 46
Mt. Lebanon takes on Gateway in Friday night basketball action. (Video by Matt Freed; 2/14/14)
No. 10 Plum (15-8) opened the third quarter with a 12-0 run to take a 32-20 lead.
But No. 7 Penn-Trafford (17-6) stormed back to take a 40-39 advantage after Maria Palarino's free throw with 4:17 left. The Warriors never trailed again.
Casey Aunkst scored 15 points and Palarino added 12 for Penn-Trafford.
Krista Pietropola scored 15 points for Plum, which lost in the first round for the fifth year in a row.
Other Class AAAA first round
■ Mt. Lebanon 63, Gateway 46: After leading by one at halftime, No. 2 seed Mt. Lebanon (16-5) used a 9-0 run to start the fourth quarter to beat Gateway (13-9) at Baldwin. Mt. Lebanon's Christine Ehland scored 18 of her 24 points in the second half.
■ North Allegheny 77, Latrobe 34: Devvin LaBarge scored 25 points and Abby Gonzales chipped in 16 to help No. 1 North Allegheny (21-1) roll to a blowout win against Latrobe (12-10) at North Hills.
■ Shaler 48, Baldwin 35: Lizzie Kline led the way with 18 points and the No. 9 Titans (16-6) outscored the Highlanders (12-9) by nine points in the third quarter en route to a victory at North Allegheny.
Class AA preliminary round
■ Beaver 56, Jeannette 20: Lexi Posset was 16 of 23 from the free-throw line and scored 28 points to vault the Bobcats (16-6) past the Jayhawks (11-12) at Fox Chapel.
■ Laurel 43, Ford City 37: The Spartans (13-9) got 17 points and 11 rebounds from Ellen Shaffer to edge the Sabers (14-8) at Butler. The Spartans outscored the Sabers, 11-5, in the fourth quarter.
■ Fort Cherry 60, Avonworth 35: Jenna Lucas scored 21 points and Rachel Bellhy added 20 in helping the Rangers (15-6) topple the Antelopes (12-10) at Chartiers Valley.
■ Washington 43, Shady Side Academy 27: Mikala Maltony had 10 points and 14 rebounds to push the Little Prexies (14-8) past the Indians (10-13) at Peters Township.
■ Mohawk 36, South Side Beaver 17: Aliya Gage scored 16 points and the Warriors (17-5) held the Rams (11-12) to five points in the first three quarters en route to a win at Moon.
■ Brentwood 49, Freedom 45: Laura McGowan's 20 points and 13 rebounds propelled the Spartans (15-6) to a narrow win against the Bulldogs (10-13) at Keystone Oaks.
■ West Shamokin 27, Riverview 21: Lizzy Cornish scored 10 points in leading the Wolves (13-10) to past the Raiders (13-10) at Plum.
■ Our Lady of the Sacred Heart 39, Apollo-Ridge 28: Courtney Alexander scored a game-high 15 points to vault the Chargers (15-7) past the Vikings (14-8) at Northgate.
■ Shenango 54, Charleroi 48: Angelina Sibeto scored 15 points and Samantha Seaburn added 13 to lead the Wildcats (13-9) past the Cougars (17-6) at Montour. Mia Woytovich led Charleroi with 19 points.