# 1975 Dutch Open – Singles

The 1975 Dutch Open – Singles was an event of the 1975 Dutch Open tennis tournament and was played on outdoor clay courts at 't Melkhuisje in Hilversum in the Netherlands from 20 July until 27 July 1975. The draw comprised 32 players. Guillermo Vilas was the defending Dutch Open champion and retained his singles title by defeating Željko Franulović in the final, 6–4, 6–7, 6–2, 6–3.

## 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 | Final | Final | Final | Final | Final |
| Guillermo Vilas | 6 | 6 | 7 | | | | | |
| Víctor Pecci | 4 | 4 | 6 | | | | | |
| Víctor Pecci | 4 | 4 | 6 | Guillermo Vilas | Guillermo Vilas | 6 | 6 | 6 |
| | | | | Željko Franulović | Željko Franulović | 4 | 7 | 2 |
| Ulrich Pinner | 5 | 1 | 7 | Željko Franulović | Željko Franulović | 4 | 7 | 2 |
| Željko Franulović | 7 | 6 | 6 | | | | | |

### Top half

| First Round | First Round | First Round | First Round | Second Round | Second Round | Second Round | Second Round | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| Guillermo Vilas | 3 | 6 | 6 | | | | | | | | | | | |
| Petr Kanderal | 6 | 2 | 2 | Guillermo Vilas | 6 | 6 | | | | | | | | |
| John Lloyd | 6 | 6 | 6 | John Lloyd | 3 | 4 | | | | | | | | |
| Louk Sanders | 2 | 7 | 2 | | | | | Guillermo Vilas | 6 | 6 | | | | |
| Jürgen Fassbender | 6 | 6 | 6 | | | | | Jürgen Fassbender | 3 | 3 | | | | |
| Martin Robinson | 7 | 4 | 2 | Jürgen Fassbender | 3 | 7 | 8 | | | | | | | |
| Dick Crealy | 6 | 3 | 6 | Dick Crealy | 6 | 6 | 6 | | | | | | | |
| Elio Lito Alvarez | 3 | 6 | 3 | | | | | | | | Guillermo Vilas | 6 | 6 | 7 |
| Ismail El Shafei | 6 | 6 | | | | | | | | | Víctor Pecci | 4 | 4 | 6 |
| Jairo Velasco Sr. | 3 | 3 | | Ismail El Shafei | 6 | 6 | 8 | | | | | | | |
| Milan Holeček | 2 | 6 | 6 | Milan Holeček | 7 | 2 | 6 | | | | | | | |
| Marcello Lara | 6 | 3 | 4 | | | | | Ismail El Shafei | 6 | 1 | | | | |
| Víctor Pecci | 6 | 6 | | | | | | Víctor Pecci | 7 | 6 | | | | |
| Julián Ganzábal | 4 | 4 | | Víctor Pecci | 6 | 6 | 6 | | | | | | | |
| Wojciech Fibak | 6 | 4 | 6 | Wojciech Fibak | 7 | 4 | 3 | | | | | | | |
| Barry Phillips-Moore | 2 | 6 | 2 | | | | | | | | | | | |

### Bottom half

| First Round | First Round | First Round | First Round | Second Round | Second Round | Second Round | Second Round | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| Ulrich Pinner | 7 | 7 | | | | | | | | | | | | |
| Tito Vázquez | 6 | 5 | | Ulrich Pinner | 6 | 6 | 7 | | | | | | | |
| Iván Molina | 6 | 2 | 6 | Iván Molina | 7 | 3 | 5 | | | | | | | |
| Patrick Proisy | 4 | 6 | 1 | | | | | Ulrich Pinner | 6 | 7 | | | | |
| Hans Kary | 7 | 3 | 7 | | | | | Nikola Špear | 2 | 5 | | | | |
| Georges Goven | 5 | 6 | 5 | Hans Kary | 6 | 3 | 6 | | | | | | | |
| Nikola Špear | 6 | 6 | | Nikola Špear | 4 | 6 | 8 | | | | | | | |
| Roger Taylor | 3 | 1 | | | | | | | | | Ulrich Pinner | 5 | 1 | 7 |
| Željko Franulović | 7 | 5 | 6 | | | | | | | | Željko Franulović | 7 | 6 | 6 |
| Patrice Dominguez | 6 | 7 | 2 | Željko Franulović | 6 | 6 | | | | | | | | |
| Hans-Jürgen Pohmann | 6 | 6 | | Hans-Jürgen Pohmann | 0 | 2 | | | | | | | | |
| Rolf Thung | 4 | 2 | | | | | | Željko Franulović | 6 | 6 | | | | |
| Nikola Pilić | 4 | 6 | 9 | | | | | François Jauffret | 3 | 0 | | | | |
| Humphrey Hose | 6 | 2 | 7 | Nikola Pilić | 6 | 6 | 4 | | | | | | | |
| François Jauffret | 6 | 4 | 6 | François Jauffret | 4 | 7 | 6 | | | | | | | |
| Norman Holmes | 3 | 6 | 0 | | | | | | | | | | | |