2021 Open de Oeiras II
# 2021 Open de Oeiras II

The 2021 Open de Oeiras II was a professional tennis tournament played on clay courts. It was the second edition of the tournament, part of the 2021 ATP Challenger Tour. It took place in Oeiras, Portugal between 5 and 11 April 2021.

## Singles main-draw entrants

### Seeds

| Country | Player | $Rank^1$ | Seed |
| - | - | - | - |
| GER | Oscar Otte | 154 | 1 |
| FRA | Enzo Couacaud | 185 | 2 |
| USA | Ernesto Escobedo | 205 | 3 |
| MAR | Elliot Benchetrit | 240 | 4 |
| ITA | Gian Marco Moroni | 241 | 5 |
| ARG | Marco Trungelliti | 247 | 6 |
| ESP | Nicola Kuhn | 250 | 7 |
| FRA | Tristan Lamasine | 257 | 8 |

* $^1$ Rankings are as of 22 March 2021.

### Other entrants

The following players received wildcards into the singles main draw:

* Pedro Araújo
* Nuno Borges
* Tiago Cação

The following player received entry into the singles main draw as a special exempt:

* Gastão Elias

The following players received entry into the singles main draw as alternates:

* Harry Bourchier
* Jonáš Forejtek

The following players received entry from the qualifying draw:

* Adrian Andreev
* Raúl Brancaccio
* Pedro Cachin
* Evan Furness

## Champions

### Singles

* Pedro Cachin def. Nuno Borges $7–6^{(7–4)},$ $7–6^{(7–3)}.$

### Doubles

* Nuno Borges / Francisco Cabral def. Pavel Kotov / Tseng Chun-hsin 6–1, 6–2.
