| Type: | ATP Challenger |
| Open de Oeiras | |
| Event Name: | Open de Oeiras |
| Location: | Oeiras, Portugal |
| Venue: | Complexo Desportivo do Jamor |
| Category: | ATP Challenger Tour |
| Surface: | Clay |
| Website: | oeirasopen.pt |
| Completed Event: | 2024 |
| Singles: |  Francisco Comesaña |
| Doubles: |  Filip BergeviMick Veldheer |
The Open de Oeiras is a professional tennis tournament played on clay courts. It is currently part of the ATP Challenger Tour. It was first held in Oeiras, Portugal during 2021.[1]
Victories records are detained by Portuguese tennis players both on singles with Gastão Elias and in doubles with Nuno Borges and Francisco Cabral with 3 victories each one. They have obtained them simultaneously two times in the 2022 I and II editions, making them one-flag winners editions.
| Year | Champion | Runner-up | Score | |
|---|---|---|---|---|
 Zdeněk Kolář | 6–4, 7–5 | |||
| Pedro Cachin | 7–6(7–4), 7–6(7–3) | |||
 Carlos Alcaraz | 6–4, 6–4 | |||
| Gastão Elias (1) | 5–7, 6–4, 6–4 | |||
| Gastão Elias (2) | 6–3, 6–4 | |||
| Gastão Elias (3) | 7–6(7–4), 6–1 | |||
 Kaichi Uchida | 6–2, 6–4 | |||
 Zsombor Piros | 6–3, 6–4 | |||
| Facundo Díaz Acosta | 6–4, 6–3 | |||
| Francisco Comesaña | 6–4, 3–6, 7–5 | |||
| Jaime Faria | 3–6, 7–6(7–3), 6–4 |
| Year | Champions | Runners-up | Score | |
|---|---|---|---|---|
| Mats Moraing Oscar Otte | 6–1, 6–4 | |||
| Nuno Borges (1) Francisco Cabral (1) | 6–1, 6–2 | |||
 Hunter ReeseSem Verbeek | 4–6, 6–4, [10–7] | |||
| Jesper de Jong Tim van Rijthoven | 6–1, 7–6(7–3) | |||
| Nuno Borges (2) Francisco Cabral (2) | 6–3, 6–0 | |||
| Nuno Borges (3) Francisco Cabral (3) | 6–4, 6–0 | |||
 Sadio Doumbia Fabien Reboul | 6–3, 3–6, [15–13] | |||
 Victor Vlad CorneaFranko Škugor | 7–6(7–2), 7–6(7–4) | |||
 Luke JohnsonSem Verbeek | 6–7(6–8), 7–5, [10–6] | |||
| Filip Bergevi Mick Veldheer | 6–1, 6–4 | |||
 Anirudh Chandrasekar Arjun Kadhe | 7–5, 6–4 |