Marina Stakusic defeated Jeļena Ostapenko 6–3, 5–7, 7–6 in the round of 16 at the WTA 250 event in Guadalajara on hard court. The result constituted a significant upset, as Ostapenko entered as the clear favourite at 1.28 odds, while Stakusic was priced at 4.1. After dropping the opening set, Stakusic levelled the match by taking a competitive second set before prevailing in a tight tiebreak to secure a career-notable victory. The upset win signals Stakusic's capability to trouble seeded opposition and advances her deeper into the tournament.