| Type: | itf women's circuit |
| Oeiras CETO Open | |
| Event Name: | Oeiras CETO Open (2023–) Magnesium K Active Ladies Open (2016–22) |
| Location: | Oeiras, Portugal |
| Venue: | Clube Escola de Ténis de Oeiras |
| Category: | ITF Women's World Tennis Tour |
| Surface: | Clay |
| Draw: | 32S/32Q/16D |
| Prize Money: | $100,000 |
| Singles: | Jana Fett |
| Doubles: | Francisca Jorge Matilde Jorge |
The Oeiras CETO Open is a tournament for professional female tennis players played on outdoor clay courts. The event is classified as a $100,000 ITF Women's World Tennis Tour tournament and has been held in Oeiras, Portugal, since 2016.[1]
| Year | Champion | Runner-up | Score | |
|---|---|---|---|---|
| Jana Fett | 6–0, 6–2 | |||
 Nigina Abduraimova | 1–6, 6–4, 6–3 | |||
| 2022 | Diana Shnaider | 6–4, 6–2 | ||
| 2021 (2) |  María Gutiérrez Carrasco | 6–3, 6–2 | ||
| 2021 (1) |  Anhelina Kalinina | 6–4, 4–6, 6–4 | ||
| 2020 | Clara Tauson | 6–3, 6–2 | ||
| 2019 | ||||
| 2018 | Ylena In-Albon | 7–5, ret. | ||
| 2017 |  Panna Udvardy | 6–7(5–7), 7–5, 6–4 | ||
| 2016 |  Angelica Moratelli | 6–4, 6–2 |
| Year | Champions | Runners-up | Score | |
|---|---|---|---|---|
| Francisca Jorge Matilde Jorge | 6–2, 6–0 | |||
 Fernanda Contreras  Ingrid Gamarra Martins | 6–3, 6–2 | |||
| 2022 | Jéssica Bouzas Maneiro Guiomar Maristany | 3–6, 6–4, [10–8] | ||
| 2021 (2) | Adrienn Nagy  Park So-hyun | 6–4, 6–0 | ||
| 2021 (1) | Suzan Lamens  Marina Melnikova | 6–3, 6–1 | ||
| 2020 | Eva Guerrero Álvarez  Diane Parry | 7–6(7–1), 6–0 | ||
| 2019 | ||||
| 2018 | Anna Klasen Romy Kölzer | 6–3, 6–3 | ||
| 2017 | Gaia Sanesi Martina Spigarelli | 6–0, 6–2 | ||
| 2016 | Andrea Ka Laëtitia Sarrazin | 4–6, 7–5, [10–3] |