Natalie Cowan shot 8-over 45 on Manteca Park Golf Course’s front nine, leading East Union’s 274-298 win over Sierra on Tuesday.
Legacy Barnes was the runner-up and spearheaded Sierra (1-2) with a 50.
East Union (2-2) scorers included Kendra Campbell (52), Presley Graham (55), Haley Leonard (60) and Chelsea Costa (62).
Backing up Barnes for the Timberwolves were Bryanna Gavino (52), Kaitlyn Looney (63), Julia Griffin (65) and Halee Looney (68).
Sierra hosts Weston Ranch today, while East Union heads to Jack Tone Golf Course in Ripon to face Lathrop.