# 2018 Poznań Open – Singles

Alexey Vatutin was the defending champion but lost in the quarterfinals to Hubert Hurkacz.
Hurkacz won the title after defeating Taro Daniel 6–1, 6–1 in the final.

## Seeds

* Taro Daniel (final)
* Guido Andreozzi (first round)
* Martin Kližan (second round)
* Pedro Sousa (first round)
* Marcel Granollers (second round)
* Quentin Halys (semifinals)
* Henri Laaksonen (second round)
* Alexey Vatutin (quarterfinals)

## 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 | Taro Daniel | 7$^8$ | 6 | | | | | |
| 6 | Quentin Halys | 6$^6$ | 3 | | | | | |
| 6 | Quentin Halys | 6$^6$ | 3 | | 1 | Taro Daniel | 1 | 1 |
| | | | | | | Hubert Hurkacz | 6 | 6 |
| | Alessandro Giannessi | 4 | 6 | 3 | | Hubert Hurkacz | 6 | 6 |
| | Hubert Hurkacz | 6 | 3 | 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 | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | T Daniel | 7 | 6 | | | | | | | | | | | | | | |
| | M Kecmanović | 5 | 3 | | 1 | T Daniel | 6 | 6 | | | | | | | | | |
| Alt | T Brkić | 1 | 4 | | Q | M Bourgue | 4 | 2 | | | | | | | | | |
| Q | M Bourgue | 6 | 6 | | | | | | | 1 | T Daniel | 6 | 7 | | | | |
| | F Bagnis | 6 | 7 | | | | | | | | F Bagnis | 4 | 5 | | | | |
| | J Kovalík | 3 | 5 | | | F Bagnis | 6 | 7$^7$ | | | | | | | | | |
| | R Quiroz | 2 | 7 | 3 | 5/WC | M Granollers | 1 | 6$^4$ | | | | | | | | | |
| 5/WC | M Granollers | 6 | 5 | 6 | | | | | | | | | | 1 | T Daniel | 7$^8$ | 6 |
| 3 | M Kližan | 6 | 6 | | | | | | | | | | | 6 | Q Halys | 6$^6$ | 3 |
| Alt | M Krueger | 2 | 2 | | 3 | M Kližan | 3 | 3 | | | | | | | | | |
| | O Otte | 2 | 6 | 3 | Q | A Arnaboldi | 6 | 6 | | | | | | | | | |
| Q | A Arnaboldi | 6 | 3 | 6 | | | | | | Q | A Arnaboldi | 1 | 6$^3$ | | | | |
| Q | A Escoffier | 6 | 6 | | | | | | | 6 | Q Halys | 6 | 7$^7$ | | | | |
| | A Santillan | 4 | 3 | | Q | A Escoffier | 6$^3$ | 7 | 4 | | | | | | | | |
| WC | VV Cornea | 1 | 4 | | 6 | Q Halys | 7$^7$ | 5 | 6 | | | | | | | | |
| 6 | Q Halys | 6 | 6 | | | | | | | | | | | | | | |

### 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 |
| 7 | H Laaksonen | 6 | 6 | | | | | | | | | | | | | | |
| | J Kubler | 4 | 2 | | 7 | H Laaksonen | 0 | 1 | | | | | | | | | |
| | D Novak | 3 | 2 | | | A Balázs | 6 | 6 | | | | | | | | | |
| | A Balázs | 6 | 6 | | | | | | | | A Balázs | 4 | 5 | | | | |
| WC | Paweł Ciaś | 3 | 6 | 4 | | | | | | | A Giannessi | 6 | 7 | | | | |
| | V Estrella Burgos | 6 | 1 | 6 | | V Estrella Burgos | 6 | 3 | 3 | | | | | | | | |
| | A Giannessi | 6 | 6 | | | A Giannessi | 4 | 6 | 6 | | | | | | | | |
| 4 | P Sousa | 2 | 3 | | | | | | | | | | | A Giannessi | 4 | 6 | 3 |
| 8 | A Vatutin | 6 | 6 | | | | | | | | | | | H Hurkacz | 6 | 3 | 6 |
| | K de Schepper | 2 | 4 | | 8 | A Vatutin | 7$^7$ | 4 | 6 | | | | | | | | |
| Q | Jeremy Jahn | 6 | 2 | 6 | Q | J Jahn | 6$^4$ | 6 | 3 | | | | | | | | |
| | K Majchrzak | 3 | 6 | 0 | | | | | | 8 | A Vatutin | 3 | 2 | | | | |
| WC | Michał Dembek | 6$^4$ | 3 | | | | | | | | H Hurkacz | 6 | 6 | | | | |
| | M Donati | 7$^7$ | 6 | | | M Donati | 3 | 7$^7$ | 3 | | | | | | | | |
| | H Hurkacz | 6 | 7 | | | H Hurkacz | 6 | 6$^5$ | 6 | | | | | | | | |
| 2 | G Andreozzi | 1 | 5 | | | | | | | | | | | | | | |