Monday

Baseball

North Allegheny at Butler, 7 p.m., Pullman Park

Allderdice at Seneca Valley, 4 p.m.

Knoch at Indiana, 4 p.m.

Mars at South Fayette, 4 p.m.

Freeport at Valley, 4 p.m.

New Brighton at North Catholic, 4 p.m., Pullman Park

Karns City at Cranberry, 4:15 p.m.

Union at North Clarion, 4:15 p.m.

A-C Valley at Forest, 4:15 p.m.

Grove City at Slippery Rock, 4 p.m.

Softball

Butler at North Allegheny, 4 p.m.

Hempfield at Seneca Valley, 4 p.m.

Knoch at Central Valley, 4 p.m.

Shaler at Mars, 3:45 p.m.

Freeport at Derry, 4 p.m.

North Catholic at Ellwood City, 4 p.m.

Karns City at Cranberry, 4:15 p.m.

A-C Valley at Forest, 4:15 p.m.

Boys Volleyball

Seneca Valley at Ambridge, 7:30 p.m.

Mars at North Hills, 7 p.m.

Boys Lacrosse

Franklin Regional at Knoch, 4 p.m.

Girls Lacrosse

Shady Side Academy at Butler, 7:30 p.m.

Fox Chapel at Seneca Valley, 7:15 p.m.

Hampton at Mars, 7:15 p.m.

Shaler at Freeport, 5 p.m.

North Catholic at Oakland Catholic, 4 p.m.

Tuesday

Baseball

Yough at Knoch, 1:30 p.m., Pullman Park

Softball

Grove City at Slippery Rock, 4 p.m.

Track and Field

WPIAL Team Championships

Class AAA

Boys

Mars, Chartiers Valley and New Castle at Seneca Valley, 4 p.m.

Girls

Butler, Franklin Regional, Greater Latrobe and West Allegheny at Baldwin, 3 p.m.

Belle Vernon, Chartiers Valley and Hampton at Seneca Valley, 4 p.m.

Regular Season

Clarion at Karns City, 4 p.m.

Cranberry at Union, 4 p.m.

A-C Valley at Redbank Valley, 4 p.m.

Boys Lacrosse

Butler at North Allegheny, 7:30 p.m.

Knoch at North Catholic, 5:30 p.m.

Mars at Greensburg Central, 7:15 p.m.

Freeport at Hampton, 7 p.m.

Girls Lacrosse

Freeport at Knoch, 6 p.m.

Boys Volleyball

Butler at Shaler, 7:30 p.m.

Seneca Valley at Pine-Richland, 7:30 p.m.