| Date: | 18–24 June |
| Edition: | 26th |
| Draw: | 32S / 16D |
| Surface: | Grass |
| Prize Money: | €2.116.915 |
| Category: | ATP World Tour 500 |
| Location: | Halle, Germany |
| Venue: | Gerry Weber Stadion |
| Champs: | Borna Ćorić[1] |
| Champd: |  Łukasz Kubot /  Marcelo Melo[2] |
| After Name: | Noventi Open |
The 2018 Gerry Weber Open was a men's tennis tournament played on outdoor grass courts. It was the 26th edition of the event and part of the ATP World Tour 500 series of the 2018 ATP World Tour. It took place at the Gerry Weber Stadion in Halle, Germany, between 18 June and 24 June 2018. Unsedeed Borna Ćorić won the singles title.
| Event | W | F | SF | QF | Round of 16 | Round of 32 | width=85 | Q | width=85 | Q2 | width=85 | Q1 |
| Singles | 500 | 300 | 180 | 90 | 45 | 0 | 20 | 10 | 0 | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubles | 0 | N/A | 45 | 25 | 0 |
| Event | W | F | SF | QF | Round of 16 | Round of 32 | width=85 | Q | width=85 | Q2 | width=85 | Q1 |
| Singles | €427.590 | €209.630 | €103.605 | €53.645 | €27.860 | €14.690 | €0 | €3.250 | €1,660 | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubles | €128.740 | €63.030 | €31.620 | €16.230 | €8.390 | N/A | N/A | N/A | N/A |
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| Roger Federer | 2 | 1 | ||
| Alexander Zverev | 3 | 2 | ||
 Austria | Dominic Thiem | 7 | 3 | |
 Spain | Roberto Bautista Agut | 16 | 4 | |
 France | Lucas Pouille | 17 | 5 | |
| Philipp Kohlschreiber | 22 | 6 | ||
 Japan | Kei Nishikori | 26 | 7 | |
| France | Richard Gasquet | 30 | 8 |
The following players received wildcards into the singles main draw:
The following players received as a special exempt:
The following players received entry from the qualifying draw:
The following players received entry as lucky losers:
Chung Hyeon → replaced by Jan-Lennard Struff
John Isner → replaced by 
Márton Fucsovics Albert Ramos Viñolas → replaced by 
Matteo Berrettini
Andrey Rublev → replaced by 
Malek Jaziri
Nikoloz Basilashvili| Country | Player | Country | Player | Rank1 | Seed | |
|---|---|---|---|---|---|---|
| Poland | Łukasz Kubot | Brazil | Marcelo Melo | 7 | 1 | |
| Nikola Mektić | Austria | Alexander Peya | 38 | 2 | ||
 Pakistan | Aisam-ul-Haq Qureshi | Jean-Julien Rojer | 43 | 3 | ||
| Ivan Dodig | Rajeev Ram | 46 | 4 |
The following pairs received wildcards into the doubles main draw:
The following pair received entry from the qualifying draw:
See main article: 2018 Gerry Weber Open – Singles.
See main article: 2018 Gerry Weber Open – Doubles.
Łukasz Kubot / Marcelo Melo defeated Alexander Zverev / Mischa Zverev, 7–6(7–1), 6–4
