Open Internacional de San Sebastián 2025
WTA 125ClaySan Sebastián, Spain6 September – 13 September 2025Prize money: 100,000 EUR43 matchesAltitude: 28 mCourt: Medium-slow
Champion Oksana Selekhmeteva · Final: 6-4 6-4
Final rounds
| Final | Oksana Selekhmeteva vs Anouk Koevermans | 6-0 6-4 |
| Semifinal | Oksana Selekhmeteva vs Tamara Korpatsch | 6-2 6-1 |
| Semifinal | Anouk Koevermans vs Darja Semenistaja | 7-5 7-6(5) |
| Quarterfinal | Oksana Selekhmeteva vs Lola Radivojevic | 7-6(3) 6-4 |
| Quarterfinal | Tamara Korpatsch vs Arantxa Rus | 7-6(8) 3-6 6-1 |
| Quarterfinal | Anouk Koevermans vs Angela Fita Boluda | 7-5 6-3 |
| Quarterfinal | Darja Semenistaja vs Carson Branstine | 6-4 6-4 |
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