McLean defeated South Lakes 1-0 in overtime in the semifinal round of the Liberty District field hockey team on Wednesday.
The No. 6 seed Seahawks and the No. 3 seed Highlanders were tied 0-0 at the end of regulation after several standout saves by goal keeper Allie Micka. The Highlanders scored in the first overtime period for the victory.
The Seahawks will play in the first round of Northern Virginia Regional playoffs next week.