Dana Guzmán secured the biggest win of her career by defeating top-seeded German veteran Tatjana Maria 6-4, 2-6, 6-4 at the ITF Edmond Open W100 in Oklahoma. The 23-year-old Peruvian, ranked No. 529 in the WTA standings, overcame the world No. 71 in a grueling Friday session to reach the quarterfinals of the tournament.

Rain Delays Force a Heavy Double-Duty Friday in Oklahoma

Severe weather forced organizers to reschedule Thursday’s matches, leaving players to battle through demanding back-to-back schedules on Friday, Oct. 16, 2026. Before her three-set battle against Maria, Guzmán needed more than two hours to overcome American Caroline Dolehide 6-3, 3-6, 6-2 in the round of 16.

Dolehide brought significant pedigree to the court, having reached No. 41 in the WTA singles rankings in January 2024, captured the W100 title in Evansville earlier in the year, and won a main-draw match at the WTA 500 in Guadalajara. Guzmán weathered Dolehide’s challenge by claiming four of the final five games in the third set.

Breaking Down the Upset Over Top-Seeded Tatjana Maria

Facing the tournament’s top seed next, Guzmán found herself tested by Maria’s trademark variety, including low slices and drop shots. After trading early blows, the Peruvian broke serve in the final game of the opening set to capture it 6-4.

The second set proved volatile as the first five games featured continuous service breaks. Maria dialed in the depth of her sliced groundstrokes to take the set 6-2. In the decisive third set, Guzmán restored her physical intensity, using cross-court angles and patient baseline rallies to run the 39-year-old German from side to side. An early break allowed Guzmán to jump to a 3-0 lead, which she protected to close out the match.

Standings Impact and Immediate Quarterfinal Test Against Sloane Stephens

By reaching the quarterfinals, Guzmán not only defended the 17 ranking points earned at the tournament the previous year but also guaranteed her return to the top 500 of the WTA rankings.

With scarcely any time to recover from her morning and afternoon commitments, Guzmán faced fifth-seeded American Sloane Stephens later on Friday. Stephens, ranked No. 133 in the world, a former world No. 3, and the 2017 US Open champion, advanced to the quarterfinals by defeating compatriot Madison Brengle 6-2, 6-3.