| 2018 Marburg Open | |
|---|---|
| Date | 2–8 July |
| Edition | 9th |
| Draw | 32S / 16D |
| Surface | Clay |
| Location | Marburg, Germany |
| Champions | |
| Singles | |
 Juan Ignacio Londero | |
| Doubles | |
 Fabrício Neis /  David Vega Hernández | |
The 2018 Marburg Open was a professional tennis tournament played on clay courts. It was the ninth edition of the tournament which was part of the 2018 ATP Challenger Tour. It took place in Marburg, Germany between 2 and 8 July 2018.
| Country | Player | Rank1 | Seed |
|---|---|---|---|
 EST
|
Jürgen Zopp | 107 | 1 |
 GER
|
Yannick Hanfmann | 111 | 2 |
 BOL
|
Hugo Dellien | 120 | 3 |
| BRA
|
Thiago Monteiro | 132 | 4 |
 POR
|
Pedro Sousa | 135 | 5 |
| BRA
|
Rogério Dutra Silva | 136 | 6 |
 RUS
|
Alexey Vatutin | 137 | 7 |
 SUI
|
Henri Laaksonen | 142 | 8 |
The following players received wildcards into the singles main draw:
The following player received entry into the singles main draw as a special exempt:
The following players received entry from the qualifying draw:
Juan Ignacio Londero def. Hugo Dellien 3–6, 7–5, 6–4. Fabrício Neis / David Vega Hernández def. Henri Laaksonen / Luca Margaroli 4–6, 6–4, [10–8].
