| Date: | 5–10 June |
| Edition: | 15th |
| Surface: | Clay |
| Location: | Poznań, Poland |
| Venue: | Park Tenisowy Olimpia |
| Champs: |  Hubert Hurkacz |
| Champd: | Mateusz Kowalczyk / Szymon Walków |
The 2018 Poznań Open was a professional tennis tournament played on clay courts. It was the fifteenth edition of the tournament which was part of the 2018 ATP Challenger Tour. It took place at the Park Tenisowy Olimpia in Poznań, Poland from 5 to 10 June 2018.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
 Japan | Taro Daniel | 82 | 1 | |
 Argentina | Guido Andreozzi | 108 | 2 | |
 Slovakia | Martin Kližan | 117 | 3 | |
| Pedro Sousa | 120 | 4 | ||
 Spain | 132 | 5 | ||
 France | 135 | 6 | ||
| 137 | 7 | |||
 Russian Federation | 140 | 8 |
The following players received wildcards into the singles main draw:
Paweł Ciaś
Victor Vlad Cornea Michał Dembek Marcel GranollersThe following players received entry into the singles main draw as alternates:
The following players received entry from the qualifying draw:
Andrea Arnaboldi Mathias Bourgue Antoine EscoffierSee main article: 2018 Poznań Open – Singles.
Hubert Hurkacz def. Taro Daniel 6–1, 6–1.See main article: 2018 Poznań Open – Doubles.
Mateusz Kowalczyk / Szymon Walków def. 
Attila Balázs / Andrea Vavassori 7–5, 6–7(8–10), [10–8].
