| Singles | |
|---|---|
| 2018 Lisboa Belém Open | |
| Champion |  Tommy Robredo |
| Runner-up |  Cristian Garín |
| Score | 3–6, 6–3, 6–2 |
Oscar Otte was the defending champion but chose not to defend his title.
Tommy Robredo won the title after defeating Cristian Garín 3–6, 6–3, 6–2 in the final.
Taro Daniel (quarterfinals)
Alex de Minaur (first round)
Gastão Elias (withdrew) Pedro Sousa (semifinals)
Marcelo Arévalo (first round)
Sebastian Ofner (semifinals)
Liam Broady (second round) Jaume Munar (second round)| Semifinals | Final | ||||||||||||
| Cristian Garín | 5 | 7 | 6 | ||||||||||
| 4 | Pedro Sousa | 7 | 5 | 4 | |||||||||
| Cristian Garín | 6 | 3 | 2 | ||||||||||
| Tommy Robredo | 3 | 6 | 6 | ||||||||||
| 6 | Sebastian Ofner | 6 | 4 | 1 | |||||||||
| Tommy Robredo | 3 | 6 | 6 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1/WC | T Daniel | 77 | 77 | ||||||||||||||||||||||||
| WC | João Monteiro | 64 | 62 | 1/WC | T Daniel | 6 | 3 | 77 | |||||||||||||||||||
| Q |  Edoardo Eremin | 5 | 6 | 4 |  L Rosol | 1 | 6 | 64 | |||||||||||||||||||
| L Rosol | 7 | 3 | 6 | 1/WC | T Daniel | 6 | 1 | 0 | |||||||||||||||||||
| Q |  JP Ficovich | 3 | 5 | C Garín | 4 | 6 | 6 | ||||||||||||||||||||
| C Garín | 6 | 7 | C Garín | 6 | 77 | ||||||||||||||||||||||
| R Olivo | 1 | 1r | 8 | J Munar | 4 | 64 | |||||||||||||||||||||
| 8 | J Munar | 6 | 4 | C Garín | 5 | 7 | 6 | ||||||||||||||||||||
| 4 | P Sousa | 6 | 7 | 4 | P Sousa | 7 | 5 | 4 | |||||||||||||||||||
| WC | F Gil | 2 | 5 | 4 | P Sousa | 6 | 6 | ||||||||||||||||||||
| L Giustino | 7 | 1 | 79 | L Giustino | 2 | 0 | |||||||||||||||||||||
| Q |  J De Loore | 5 | 6 | 67 | 4 | P Sousa | 6 | 6 | |||||||||||||||||||
| G Oliveira | 3 | 5 |  F Auger-Aliassime | 3 | 1 | ||||||||||||||||||||||
| F Auger-Aliassime | 6 | 7 | F Auger-Aliassime | 6 | 7 | ||||||||||||||||||||||
| J Domingues | 6 | 6 | J Domingues | 4 | 5 | ||||||||||||||||||||||
| 5 | M Arévalo | 2 | 2 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 6 | S Ofner | 6 | 6 | ||||||||||||||||||||||||
| WC | T Cação | 0 | 3 | 6 | S Ofner | 6 | 6 | ||||||||||||||||||||
 E King | 3 | 0 | M Krueger | 3 | 4 | ||||||||||||||||||||||
| M Krueger | 6 | 6 | 6 | S Ofner | 6 | 7 | |||||||||||||||||||||
 M Kecmanović | 6 | 77 | M Kecmanović | 4 | 5 | ||||||||||||||||||||||
 T Bellucci | 3 | 64 | M Kecmanović | 6 | 6 | ||||||||||||||||||||||
| D Novak | 65 | 1 | LL | F Gaio | 4 | 2 | |||||||||||||||||||||
| LL | F Gaio | 77 | 6 | 6 | S Ofner | 6 | 4 | 1 | |||||||||||||||||||
| 7 | L Broady | 77 | 6 | T Robredo | 3 | 6 | 6 | ||||||||||||||||||||
 S Robert | 63 | 4 | 7 | L Broady | 3 | 6 | 3 | ||||||||||||||||||||
| T Robredo | 6 | 6 | T Robredo | 6 | 4 | 6 | |||||||||||||||||||||
| R Ojeda Lara | 2 | 2 | T Robredo | 7 | 6 | ||||||||||||||||||||||
| C Harrison | 6 | 6 | C Harrison | 5 | 1 | ||||||||||||||||||||||
| G Sakharov | 0 | 4 | C Harrison | 5 | 710 | 6 | |||||||||||||||||||||
| Q | A Davidovich Fokina | 77 | 6 | Q | A Davidovich Fokina | 7 | 68 | 1 | |||||||||||||||||||
| 2 | A de Minaur | 65 | 4 | ||||||||||||||||||||||||
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