White Bear Lake and Mahtomedi will duel for the Section 4 boys lacrosse championship on Wednesday, 7:30 p.m., in White Bear Lake. Mahtomedi (10-5) upset top-seeded, unbeaten, No. 2 ranked Stillwater 13-11 in the semifinals Monday, led by E.J. Charpentier with six goals, while White Bear Lake (12-3) beat Irondale 16-10. Mahtomedi has won the last two section titles.