Four Washtenaw County high school basketball teams play MHSAA regional semifinal games on Monday. Check back in the evening for AnnArbor.com's complete coverage.

First, here’s a quick preview of each matchup:

Huron (17-6) vs. Orchard Lake St. Mary’s (12-10)

What: Class A regional semifinal. (Bracket)

Where: Novi High School. (Directions)

When: 5:30 p.m. Monday.

Winner plays: Walled Lake Central (17-6) vs. Detroit Catholic Central (16-6) winner, 7 p.m. Wednesday.

District results: Huron beat Pinckney (56-49) and Pioneer (61-48); St. Mary’s beat North Farmington (80-57) and Farmington (42-40, OT).

Notable: Huron is playing in its school record fourth straight regional tournament.

Father Gabriel Richard (9-14) vs. Lansing Sexton (22-1)

What: Class B regional semifinal. (Bracket)

Where: Jackson Lumen Christi High School. (Directions)

When: 8 p.m. Monday.

Winner plays: Marshall (13-10) vs. Stockbridge (7-15) winner, 7 p.m. Wednesday.

District results: Gabriel Richard beat Adrian (53-45), Chelsea (59-52) and Onsted (75-51); Sexton beat Eaton Rapids (71-26), Haslett (72-38) and Lansing Catholic (66-56).

Notable: Sexton is the No. 1-ranked team in Class B and has three future Division I seniors on its roster in Denzel Washington (Michigan State), Anthony Clemmons (Iowa) and Bryn Forbes (Cleveland State).

Willow Run (10-13) vs. Hudson (11-11)

What: Class C regional semifinal. (Bracket)

Where: Manchester High School. (Directions)

When: 6 p.m. Monday.

Winner plays: River Rouge (17-4) vs. Monroe St. Mary (15-7) winner, 7:30 p.m. Wednesday.

District results: Willow Run beat Clinton (59-39), Greenhills (79-63) and Napoleon (68-57); Hudson beat Sand Creek (58-39) and Adrian Madison (59-55).

Notable: This is Willow Run’s first regional appearance in 11 years. The Flyers won a Class B regional in 2001 before losing to eventual state champion Detroit Crockett in a quarterfinal.

Central Academy (13-8) vs. Lansing Christian (10-12)

What: Class D regional semifinal. (Bracket)

Where: Morenci High School. (Directions)

When: 7 p.m. Monday.

Winner plays: North Adams-Jerome (20-2) vs. Allen Park Inter-City Baptist (15-8) winner, 5:30 p.m. Wednesday.

District results: Central Academy beat Eastern Washtenaw Multicultural Academy (57-46), Rudolf Steiner (65-60); Lansing Christian beat Webberville (45-42), Morrice (73-53).

Notable: Central Academy is playing in its second straight regional but still seeking its first win. The Falcons lost to Inter-City Baptist, 56-45, in the first round last year.