By Guadalajara Open Produces a Major Upset
The Guadalajara Open is one of the main stories in women’s tennis today, with the tournament moving toward its semifinals. Eighth seed Liudmila Samsonova produced one of the day’s biggest results by defeating top seed Marta Kostyuk 4-6, 6-2, 7-5 in a three-set quarterfinal. The victory sends Samsonova into her first semifinal of the 2026 season.
Samsonova had already recorded two victories in Guadalajara before facing Kostyuk, and her run has now become one of the notable developments on the WTA Tour this week.
Samsonova Continues Her Guadalajara Run
The Russian’s victory over Kostyuk was a demanding contest. After dropping the opening set, Samsonova recovered strongly, taking the second set 6-2 before completing the comeback with a 7-5 deciding set.
Her semifinal opponent will be determined by the quarterfinal between Peyton Stearns and Sloane Stephens. The other Guadalajara semifinal is scheduled to feature defending champion Iva Jovic against Spain’s Cristina Bucsa.
Jovic and Bucsa Reach the Semifinals
Defending champion Iva Jovic also made a strong statement in Guadalajara, defeating seventh seed Magdalena Frech 6-2, 6-1. Jovic’s result puts her into another semifinal as she continues her title defence.
Cristina Bucsa also advanced, defeating third seed Sara Bejlek 6-0, 6-4. The Spanish player will now face Jovic in the next round.
The Guadalajara draw has therefore produced an interesting combination of established players, seeded contenders and emerging talent as the tournament approaches its final stages.
Sao Paulo Provides Another WTA Storyline
The Sao Paulo Open is another tournament attracting attention today. American player Mary Stoiana reached her first WTA Tour quarterfinal after defeating Czech player Dominika Salkova 7-6(5), 6-1.
Stoiana, ranked 116th in the world, will next face second seed Paula Badosa. Badosa reached the quarterfinal by recovering from a set down to defeat Argentina’s Jazmin Ortenzi 4-6, 6-2, 6-2.
Other players advancing in Sao Paulo include Anna Blinkova, Kaitlin Quevedo, Alina Charaeva, Suzan Lamens and Nadia Podoroska.
Davis Cup Action Continues
The men’s tennis calendar is also busy, with Davis Cup ties taking place today. The schedule includes matchups involving players such as Kwon Soonwoo and Suresh Dhakshineswar, Chung Hyeon and Sumit Nagal, Jakub Mensik and Learner Tien, and Jiri Lehecka against Ben Shelton.
Davis Cup competition provides a different atmosphere from regular ATP events because players represent their countries, adding a team dimension to the individual sport. Today’s schedule includes matches on both hard and clay courts.
Challenger Tennis Adds More Matches
Alongside the headline WTA and Davis Cup competitions, several ATP Challenger events are taking place. The Friday schedule includes quarterfinal action in tournaments such as Biella and Guangzhou 2, while Tiburon, Rennes, Szczecin and other events are also providing competitive matches.
These tournaments are important for players attempting to improve their rankings and earn opportunities at higher-level ATP events.
What to Watch in Tennis Today
The biggest focus today is on the continuing semifinal race in Guadalajara and the quarterfinal action in Sao Paulo. The Guadalajara tournament has already produced a notable upset through Samsonova’s victory over Kostyuk, while Jovic is attempting to continue her title defence.
The broader tennis calendar also features Davis Cup ties and numerous Challenger events, ensuring that fans have matches to follow across several competitions and time zones.
With the 2026 US Open now completed and the tennis season moving into its later stages, the results from Guadalajara, Sao Paulo and the Davis Cup will be important parts of the current post-Grand-Slam storyline.
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