2026 Open de Oeiras II
Tennis tournament
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The 2026 Open de Oeiras II was a professional tennis tournament played on clay courts. It was the 15th edition of the tournament which was part of the 2026 ATP Challenger Tour. It took place in Oeiras, Portugal between 11 and 16 May 2026.
| 2026 Open de Oeiras II | |
|---|---|
| Date | 11–16 May |
| Edition | 15th |
| Surface | Clay |
| Location | Oeiras, Portugal |
| Champions | |
| Singles | |
 Laslo Djere | |
| Doubles | |
 Siddhant Banthia /  Alexander Donski | |
Singles main-draw entrants
Seeds
| Country | Player | Rank1 | Seed |
|---|---|---|---|
 CHI |
Cristian Garín | 104 | 1 |
 USA |
Emilio Nava | 108 | 2 |
 POR |
Jaime Faria | 119 | 3 |
| POR |
Henrique Rocha | 120 | 4 |
 LTU |
Vilius Gaubas | 121 | 5 |
 BOL |
Hugo Dellien | 133 | 6 |
| CHI |
Tomás Barrios Vera | 134 | 7 |
 GBR |
Jack Pinnington Jones | 137 | 8 |
- 1 Rankings are as of 4 May 2026.[1]
Other entrants
The following players received wildcards into the singles main draw:
The following players received entry into the singles main draw through the Next Gen Accelerator programme:
Darwin Blanch
Petr Brunclík
The following players received entry into the singles main draw as alternates:
The following players received entry from the qualifying draw:
Champions
Singles
Laslo Djere def. Emilio Nava 6–3, 6–4.
Doubles
Siddhant Banthia / 
Alexander Donski def. 
Tiago Pereira / 
David Vega Hernández 6–3, 6–2.