Three-time defending WPIAL champion South Fayette opens the WPIAL girls basketball playoffs as the favorite to repeat again after earning a No. 1 seed Monday in Class 5A.

The top-seeded boys teams were Upper St. Clair in 6A, Montour in 5A, Belle Vernon in 4A, Aliquippa in 3A, Greensburg Central Catholic in 2A and Neighborhood Academy in A. Joining the Lions as No. 1 girls seeds were Norwin in Class 6A, Blackhawk in 4A, Shady Side Academy in 3A, Neshannock in 2A and Union in A.

The 12 tournaments conclude with championship games Feb. 27-March 1 at Petersen Events Center.

The playoffs begin Thursday with preliminary round games. However, most brackets don’t start play until next week.

This story will be updated.

WPIAL championships

Boys

Class 6A

First round

Monday’s schedule

Woodland Hills at Seneca Valley, 7 p.m.

North Hills at Butler, 7 p.m.

Norwin at Mt. Lebanon, 7 p.m.

Quarterfinals

Feb. 20 schedule

Woodland Hills/Seneca Valley winner at Upper. St. Clair, TBA

Central Catholic at Fox Chapel, TBA

North Hills/Butler winner at New Castle, TBA

Norwin/Mt. Lebanon vs. Imani Christian, TBA

Class 5A

Preliminary round

Thursday’s schedule

Indiana at Franklin Regional, 7 p.m.

First round

Tuesday’s schedule

Indiana/Franklin Regional at Montour, 7 p.m.

Latrobe at Kiski Area, 7 p.m.

Thomas Jefferson at Chartiers Valley, 7 p.m.

Gateway at Moon, 7 p.m.

Penn-Trafford at Baldwin, 7 p.m.

Mars at South Fayette, 7 p.m.

Hampton at Uniontown, 7 p.m.

Penn Hills at Peters Township, 7 p.m.

Class 4A

First round

Friday’s schedule

Highlands at Elizabeth Forward, 7 p.m.

West Mifflin at Knoch, 7 p.m.

Quaker Valley at Deer Lakes, 7 p.m.

Derry at Central Valley, 7 p.m.

Quarterfinals

Feb. 19 schedule

Highlands/Elizabeth Forward winner at Belle Vernon, TBA

West Mifflin/Knoch winner at Avonworth, TBA

Quaker Valley/Deer Lakes winner at North Catholic, TBA

Derry/Central Valley winner at Beaver, TBA

Class 3A

First round

Feb. 18 schedule

New Brighton at Aliquippa, 8 p.m.

Shady Side Academy at McGuffey, 7 p.m.

Seton LaSalle at Bishop Canevin, 7 p.m.

Ligonier Valley at Keystone Oaks, 8 p.m.

Charleroi at South Allegheny, 7 p.m.

Ellwood City at South Park, 7 p.m.

Waynesburg at Mohawk, 7 p.m.

Carlynton at Southmoreland, 7 p.m.

Class 2A

Preliminary round

Thursday’s schedule

Springdale at Jefferson-Morgan, 7 p.m.

Beth-Center vs. Winchester Thurston at Peters Township, 6 p.m.

Eden Christian at Laurel, 7 p.m.

South Side vs. Bentworth at Peters Township, 7:30 p.m.

Brentwood at West Greene, 7 p.m.

First round

Monday’s schedule

Eden Christian/Laurel winner at Greensburg Central Catholic, 7 p.m.

Fort Cherry at Union, 7 p.m.

Beth-Center/Winchester Thurston winner at Neshannock, 7 p.m.

Springdale/Jefferson-Morgan winner at Northgate, 7 p.m.

South Side/Bentworth winner at Sewickley Academy, 7 p.m.

Shenango at Chartiers-Houston, 7 p.m.

Brentwood/West Greene winner at Jeannette, 7 p.m.

Clairton at OLSH, 7 p.m.

Class A

Quarterfinals

Feb. 19 schedule

Beaver County Christian vs. Neighborhood Academy at Shaler, TBA

Geibel Catholic vs. Aquinas Academy, TBA

Summit Academy at Serra Catholic, TBA

Monessen vs. Nazareth Prep at Sewickley Academy, TBA

Girls

Class 6A

Quarterfinals

Feb. 20 schedule

Butler at Canon-McMillan, 6 p.m.

Feb. 21 schedule

North Allegheny at Norwin, TBA

Pine-Richland at Upper St. Clair, TBA

Mt. Lebanon at Seneca Valley, TBA

Class 5A

First round

Friday’s schedule

Greensburg Salem at South Fayette, 7 p.m.

Baldwin at Chartiers Valley, 8 p.m.

Mars at Shaler, 7 p.m.

Bethel Park at Franklin Regional, 7 p.m.

Fox Chapel at Peters Township, 7 p.m.

Moon at Indiana, 7 p.m.

Plum at Penn-Trafford, 7 p.m.

Latrobe at Thomas Jefferson, 7 p.m.

Class 4A

Preliminary round

Thursday’s schedule

Highlands at Yough, 7 p.m.

First round

Monday’s schedule

Highlands/Yough winner at Blackhawk, 7 p.m.

Knoch at Laurel Highlands, 7 p.m.

Hopewell at Elizabeth Forward, 7 p.m.

Freeport at Beaver, 7 p.m.

Hampton at Oakland Catholic, 7 p.m.

Belle Vernon at Central Valley, 7 p.m.

Mt. Pleasant at North Catholic, 7 p.m.

Burrell at South Park, 7 p.m.

Class 3A

First round

Friday’s schedule

Shady Side Academy bye

Deer Lakes at Riverside, 7 p.m.

Ligonier Valley at Keystone Oaks, 6 p.m.

Ellwood City at Seton LaSalle, 6 p.m.

Brownsville at Greensburg Central Catholic, 7 p.m.

McGuffey at Quaker Valley, 7 p.m.

South Allegheny at OLSH, 7 p.m.

Beaver Falls at Avonworth, 7 p.m.

Class 2A

Preliminary round

Thursday’s schedule

Bentworth at Apollo-Ridge, 7 p.m.

First round

Tuesday’s schedule

Bentworth/Apollo-Ridge at Neshannock, 7 p.m.

Beth-Center at Laurel, 7 p.m.

Ellis School at South Side, 7 p.m.

California at Fort Cherry, 7 p.m.

Carmichaels at Aliquippa, 6 p.m.

Rochester at Riverview, 7 p.m.

Burgettstown at Winchester Thurston, 6 p.m.

Brentwood at Chartiers-Houston, 7 p.m.

Class A

First round

Monday’s schedule

Bishop Canevin at Springdale, 7 p.m.

Eden Christian at West Greene, 7 p.m.

Sewickley Academy at St. Joseph, 7 p.m.

Quarterfinals

Feb. 20 schedule

Bishop Canevin/Springdale winner at Union, TBA

Aquinas Academy at Serra Catholic, TBA

Eden Christian/West Greene winner at Geibel Catholic, TBA

Sewickley Academy/St. Joseph winner at Clairton, TBA