Mattoon is the top-ranked team in its Class 3A girls basketball regional and is the second-ranked team in its sub-sectional, the IHSA announced Saturday.

The Green Wave (23-5) earned a first-round bye in the Centralia regional where it will play the winner between Marion and Carbondale at 6 p.m. on Feb. 18. A victory would pit Mattoon against the winner between Centralia and Herrin in the regional title game Feb. 20.

Charleston faces sectional No. 1 Olney in its regional at Richland County High School on Feb. 17. The winner of that game faces the Effingham-Mt. Vernon winner for the championship.

The two regional winners advance into an Effingham sectional that includes schools from the Jerseyville and Troy regionals.