# 2025 Oeiras Indoors – Singles

Leandro Riedi was the defending champion but chose not to defend his title.
Hamad Medjedovic won the title after defeating Liam Draxl 6–1, 6–3 in the final.

## Seeds

* Hamad Medjedovic (champion)
* Alexander Ritschard (quarterfinals)
* Beibit Zhukayev (first round)
* Denis Yevseyev (first round)
* Liam Draxl (final)
* Matías Soto (first round)
* Zsombor Piros (quarterfinals)
* Pol Martín Tiffon (first round)

## Draw
### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking

### Finals

| Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| 1 | Hamad Medjedovic | 6$^2$ | 6 | 7 | | | | |
| | Daniel Rincón | 7$^7$ | 4 | 5 | | | | |
| | Daniel Rincón | 7$^7$ | 4 | 5 | 1 | Hamad Medjedovic | 6 | 6 |
| | | | | | 5 | Liam Draxl | 1 | 3 |
| | Rudolf Molleker | 6$^6$ | 0 | | 5 | Liam Draxl | 1 | 3 |
| 5 | Liam Draxl | 7$^8$ | 6 | | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | H Medjedovic | 1 | 7$^7$ | 6 | | | | | | | | | | | | | | | |
| Q | E Gerasimov | 6 | 6$^4$ | 4 | 1 | H Medjedovic | 6 | 2 | | | | | | | | | | | |
| WC | F Ferreira Silva | 6$^6$ | 6 | 6 | WC | F Ferreira Silva | 1 | 1$^r$ | | | | | | | | | | | |
| Q | T Hilderbrand | 7$^8$ | 2 | 4 | | | | | | 1 | H Medjedovic | 6 | 6 | | | | | | |
| | D Mérida | 6 | 4 | 6$^5$ | | | | | | 7 | Z Piros | 3 | 3 | | | | | | |
| WC | D Vale | 2 | 6 | 7$^7$ | WC | D Vale | 1 | 3 | | | | | | | | | | | |
| Q | R Berankis | 3 | 5 | | 7 | Z Piros | 6 | 6 | | | | | | | | | | | |
| 7 | Z Piros | 6 | 7 | | | | | | | | | | | | 1 | H Medjedovic | 6$^2$ | 6 | 7 |
| 3 | B Zhukayev | 6 | 2 | 3 | | | | | | | | | | | | D Rincón | 7$^7$ | 4 | 5 |
| | Micah Braswell | 1 | 6 | 6 | | M Braswell | 2 | 7$^7$ | 5 | | | | | | | | | | |
| | G Elias | 3 | 3 | | | D Rincón | 6 | 6$^5$ | 7 | | | | | | | | | | |
| | D Rincón | 6 | 6 | | | | | | | | D Rincón | 3 | 6 | 6 | | | | | |
| WC | Pedro Araújo | 4 | 6 | 2 | | | | | | | MH Rehberg | 6 | 4 | 2 | | | | | |
| Q | I Gakhov | 6 | 3 | 6 | Q | I Gakhov | 5 | 3 | | | | | | | | | | | |
| | MH Rehberg | 6 | 6 | | | MH Rehberg | 7 | 6 | | | | | | | | | | | |
| 6 | M Soto | 4 | 3 | | | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 8 | Pol Martín Tiffon | 6$^3$ | 2 | | | | | | | | | | | | | | |
| | R Molleker | 7$^7$ | 6 | | | R Molleker | 6 | 6 | | | | | | | | | |
| | R Bertrand | 2 | 3 | | | K Sell | 4 | 4 | | | | | | | | | |
| | Karue Sell | 6 | 6 | | | | | | | | R Molleker | 6 | 6 | | | | |
| | L Giustino | 4 | 1 | | | | | | | | A Cornut-Chauvinc | 3 | 4 | | | | |
| | E Kırkın | 6 | 6 | | | E Kırkın | 5 | 2 | | | | | | | | | |
| | Antoine Cornut-Chauvinc | 6 | 0 | 6 | | A Cornut-Chauvinc | 7 | 6 | | | | | | | | | |
| 4 | D Yevseyev | 2 | 6 | 3 | | | | | | | | | | | R Molleker | 6$^6$ | 0 |
| 5 | L Draxl | 5 | 6 | 6 | | | | | | | | | | 5 | L Draxl | 7$^8$ | 6 |
| | JJ Wolf | 7 | 2 | 4 | 5 | L Draxl | 3 | 6 | 7$^9$ | | | | | | | | |
| | Samuel Vincent Ruggeri | 6 | 6 | | | S Vincent Ruggeri | 6 | 1 | 6$^7$ | | | | | | | | |
| | M Dodig | 1 | 2 | | | | | | | 5 | L Draxl | 6 | 6 | | | | |
| Q | A Zakharov | 3 | 4 | | | | | | | 2 | A Ritschard | 4 | 1 | | | | |
| | B Zapata Miralles | 6 | 6 | | | B Zapata Miralles | 6$^2$ | 4 | | | | | | | | | |
| Q | S Fanselow | 4 | 4 | | 2 | A Ritschard | 7$^7$ | 6 | | | | | | | | | |
| 2 | A Ritschard | 6 | 6 | | | | | | | | | | | | | | |