Cody Heinze made several saves and Quinn Burgard and Seamus played strong defensive games to help San Marcos defeat rival Santa Barbara High, 14-5, in a regular-season boys lacrosse finale on Wednesday.
Jack Wiebe, Jack Van Thyne and Rowan Fields scored multiple goals for the Royals, who await the CIF playoff draw.
San Marcos avenged an earlier defeat to the Dons.
Dos Pueblos 14, Grace Brethren l1
Gus Miller scored five goals and picked up seven ground balls to spark the Chargers to a win over Grace Brethren in the regular-season finale.
Daniel Finneran had a career-best four goals and Cal Denier won 17 of 22 faceoffs.
In goal, Salem Bawaneh played a strong second half and made 11 saves to secure the win.
Dos Pueblos finishes 2-8 in league and 5-10 overall.