| 2018 Lisboa Belém Open | |
|---|---|
| Date | 14–20 May |
| Edition | 2nd |
| Surface | Clay |
| Location | Lisbon, Portugal |
| Champions | |
| Singles | |
 Tommy Robredo | |
| Doubles | |
 Marcelo Arévalo /  Miguel Ángel Reyes-Varela | |
The 2018 Lisboa Belém Open was a professional tennis tournament played on clay courts. It was the second edition of the tournament which was part of the 2018 ATP Challenger Tour. It took place in Lisbon, Portugal between 14 and 20 May 2018.
| Country | Player | Rank1 | Seed |
|---|---|---|---|
 JPN
|
Taro Daniel | 82 | 1 |
 AUS
|
Alex de Minaur | 109 | 2 |
 POR |
|||
| POR
|
Pedro Sousa | 144 | 4 |
| ESA
|
Marcelo Arévalo | 147 | 5 |
 AUT
|
Sebastian Ofner | 148 | 6 |
 GBR
|
Liam Broady | 163 | 7 |
| ESP
|
Jaume Munar | 164 | 8 |
The following players received wildcards into the singles main draw:
Tiago Cação Taro Daniel Fred Gil João MonteiroThe following players received entry from the qualifying draw:
Alejandro Davidovich Fokina
Joris De Loore
Edoardo Eremin
Juan Pablo FicovichThe following player received entry as a lucky loser:
Tommy Robredo def. 
Christian Garín 3–6, 6–3, 6–2. Marcelo Arévalo / Miguel Ángel Reyes-Varela def. 
Tomasz Bednarek / 
Hunter Reese 6–3, 3–6, [10–1].
