Southwestern, one of the preseason Mission Conference favorites, is on schedule thus far.
The Apaches are tied for first place with Riverside, which upset Saddleback, 21-16, Saturday. Southwestern's victory ended the Gauchos' 49-game home winning streak.
Southwestern plays Rancho Santiago this week at home. The Dons opened the season with two victories but lost to Riverside, 31-28, two weeks ago when a last-second 44-yard field-goal attempt went wide.
San Diego Mesa beat Rancho Santiago, 31-19, last week. Mesa quarterback Jeff Sturch was 23 for 37 for 309 yards and 2 touchdowns.