# 2018 The Hague Open – Singles

Guillermo García López was the defending champion but chose not to defend his title.
Thiemo de Bakker won the title after defeating Yannick Maden 6–2, 6–1 in the final.

## Seeds

* Yannick Maden (final)
* Adam Pavlásek (first round)
* Mats Moraing (first round)
* Oscar Otte (quarterfinals)
* Matteo Donati (first round)
* Carlos Berlocq (withdrew)
* Attila Balázs (quarterfinals)
* Grégoire Barrère (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 | Final | Final | Final | Final |
| 1 | Yannick Maden | 6 | 6 | | | | |
| | Lukáš Rosol | 3 | 4 | | | | |
| | Lukáš Rosol | 3 | 4 | 1 | Yannick Maden | 2 | 1 |
| | | | | WC | Thiemo de Bakker | 6 | 6 |
| Q | Kimmer Coppejans | 1 | 4 | WC | Thiemo de Bakker | 6 | 6 |
| WC | Thiemo de Bakker | 6 | 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 |
| 1 | Y Maden | 7$^7$ | 6 | | | | | | | | | | | | | | | |
| Q | A Davidovich Fokina | 6$^4$ | 1 | | 1 | Y Maden | 6 | 6 | | | | | | | | | | |
| WC | T van Rijthoven | 3 | 3 | | LL | M Netuschil | 3 | 1 | | | | | | | | | | |
| LL | Marvin Netuschil | 6 | 6 | | | | | | | 1 | Y Maden | 6 | 6$^7$ | 6 | | | | |
| | L Harris | 1 | 7$^7$ | 3 | | | | | | 7 | A Balázs | 2 | 7$^9$ | 3 | | | | |
| | N Kuhn | 6 | 6$^1$ | 6 | | N Kuhn | 3 | 4 | | | | | | | | | | |
| WC | J Sels | 3 | 6$^3$ | | 7 | A Balázs | 6 | 6 | | | | | | | | | | |
| 7 | A Balázs | 6 | 7$^7$ | | | | | | | | | | | | 1 | Y Maden | 6 | 6 |
| 3 | M Moraing | 3 | 2 | | | | | | | | | | | | | L Rosol | 3 | 4 |
| | B Rola | 6 | 6 | | | B Rola | 6 | 6 | | | | | | | | | | |
| | B Zapata Miralles | 7 | 6 | | | B Zapata Miralles | 4 | 4 | | | | | | | | | | |
| Q | E Benchetrit | 5 | 1 | | | | | | | | B Rola | 4 | 7$^8$ | 4 | | | | |
| | L Rosol | 6 | 6 | | | | | | | | L Rosol | 6 | 6$^6$ | 6 | | | | |
| | V Šafránek | 3 | 2 | | | L Rosol | 4 | 7$^7$ | 6 | | | | | | | | | |
| | T Kamke | 6 | 3 | 7$^7$ | | T Kamke | 6 | 6$^4$ | 4 | | | | | | | | | |
| LL | Jeremy Jahn | 4 | 6 | 6$^5$ | | | | | | | | | | | | | | |

### 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 | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 5 | M Donati | 4 | 3 | | | | | | | | | | | | | | | |
| | A Hoang | 6 | 6 | | | A Hoang | 3 | 2 | | | | | | | | | | |
| | S Griekspoor | 6 | 4 | 3 | Q | K Coppejans | 6 | 6 | | | | | | | | | | |
| Q | K Coppejans | 2 | 6 | 6 | | | | | | Q | K Coppejans | 7 | 6 | | | | | |
| WC | B van de Zandschulp | 7 | 6 | | | | | | | 4 | O Otte | 5 | 4 | | | | | |
| | J Choinski | 5 | 2 | | WC | B van de Zandschulp | 6$^1$ | 4 | | | | | | | | | | |
| | G Oliveira | 6$^5$ | 2 | | 4 | O Otte | 7$^7$ | 6 | | | | | | | | | | |
| 4 | O Otte | 7$^7$ | 6 | | | | | | | | | | | | Q | K Coppejans | 1 | 4 |
| 8 | G Barrère | 5 | 5 | | | | | | | | | | | | WC | T de Bakker | 6 | 6 |
| | D Brown | 7 | 7 | | | D Brown | 6 | 2 | 3 | | | | | | | | | |
| | A Giannessi | 3 | 6 | 6 | | A Giannessi | 4 | 6 | 6 | | | | | | | | | |
| | T-h Yang | 6 | 1 | 3 | | | | | | | A Giannessi | 6 | 6$^7$ | 4 | | | | |
| Q | G Brouwer | 3 | 0 | | | | | | | WC | T de Bakker | 3 | 7$^9$ | 6 | | | | |
| | U Ignatik | 6 | 6 | | | U Ignatik | 4 | 6$^4$ | | | | | | | | | | |
| WC | T de Bakker | 6$^6$ | 7$^7$ | 6 | WC | T de Bakker | 6 | 7$^7$ | | | | | | | | | | |
| 2 | A Pavlásek | 7$^8$ | 6$^3$ | 3 | | | | | | | | | | | | | | |