# 2018 Båstad Challenger – Singles

Dušan Lajović was the defending champion but chose not to defend his title.
Pedro Martínez won the title after defeating Corentin Moutet 7–6$^{(7–5)}$, 6–4 in the final.

## Seeds

* Guido Andreozzi (second round)
* Elias Ymer (first round)
* Corentin Moutet (final)
* Thiago Monteiro (second round)
* Henri Laaksonen (first round)
* Calvin Hemery (second round)
* Félix Auger-Aliassime (first round, retired)
* Oscar Otte (first round)

## Draw
### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking

### Finals

| Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| Q | Filip Horanský | 4 | 6 | 3 | | | | |
| 3 | Corentin Moutet | 6 | 4 | 6 | | | | |
| 3 | Corentin Moutet | 6 | 4 | 6 | 3 | Corentin Moutet | 6$^5$ | 4 |
| | | | | | | Pedro Martínez | 7$^7$ | 6 |
| | Pedro Martínez | 6 | 6 | | | Pedro Martínez | 7$^7$ | 6 |
| WC | Mikael Ymer | 3 | 4 | | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | G Andreozzi | 2 | 6 | 6 | | | | | | | | | | | | | | |
| | A Collarini | 6 | 4 | 2 | 1 | G Andreozzi | 4 | 7 | 6$^4$ | | | | | | | | | |
| | L Rosol | 6 | 6 | | | L Rosol | 6 | 5 | 7$^7$ | | | | | | | | | |
| | J Tatlot | 3 | 2 | | | | | | | | L Rosol | 3 | 1 | | | | | |
| Q | F Horanský | 6 | 0 | | | | | | | Q | F Horanský | 6 | 6 | | | | | |
| | S Nagal | 2 | 0$^r$ | | Q | F Horanský | 7$^8$ | 6 | | | | | | | | | | |
| | L Harris | 6 | 6 | | | L Harris | 6$^6$ | 4 | | | | | | | | | | |
| 5 | H Laaksonen | 4 | 4 | | | | | | | | | | | Q | F Horanský | 4 | 6 | 3 |
| 3 | C Moutet | 6 | 6 | | | | | | | | | | | 3 | C Moutet | 6 | 4 | 6 |
| | Ze Zhang | 2 | 4 | | 3 | C Moutet | 6 | 3 | 6 | | | | | | | | | |
| | G Oliveira | 6 | 7 | | | G Oliveira | 4 | 6 | 2 | | | | | | | | | |
| WC | J Mridha | 4 | 5 | | | | | | | 3 | C Moutet | 7 | 6 | | | | | |
| | U Ignatik | 7$^9$ | 4 | | | | | | | | C Lestienne | 5 | 3 | | | | | |
| Q | Jules Okala | 6$^7$ | 0$^r$ | | | U Ignatik | 1 | 4 | | | | | | | | | | |
| | C Lestienne | 6 | 3 | | | C Lestienne | 6 | 6 | | | | | | | | | | |
| 7 | F Auger-Aliassime | 4 | 2$^r$ | | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 8 | O Otte | 2 | 4 | | | | | | | | | | | | | | | |
| Q | D Wu | 6 | 6 | | Q | D Wu | 6 | 4 | 2 | | | | | | | | | |
| | V Šafránek | 6 | 0 | 7 | | V Šafránek | 1 | 6 | 6 | | | | | | | | | |
| WC | F Bergevi | 3 | 6 | 5 | | | | | | | V Šafránek | 5 | 2 | | | | | |
| | P Martínez | 6 | 6 | | | | | | | | P Martínez | 7 | 6 | | | | | |
| Q | G Blancaneaux | 4 | 1 | | | P Martínez | 6 | 6 | | | | | | | | | | |
| LL | L Klein | 4 | 6$^4$ | | 4 | T Monteiro | 4 | 4 | | | | | | | | | | |
| 4 | T Monteiro | 6 | 7$^7$ | | | | | | | | | | | | | P Martínez | 6 | 6 |
| 6 | C Hemery | 6 | 6 | | | | | | | | | | | | WC | M Ymer | 3 | 4 |
| WC | M Eriksson | 4 | 1 | | 6 | C Hemery | 4 | 6 | 2 | | | | | | | | | |
| | Z Kolář | 3 | 6 | 0 | WC | M Ymer | 6 | 3 | 6 | | | | | | | | | |
| WC | M Ymer | 6 | 1 | 6 | | | | | | WC | M Ymer | 6 | 4 | 7 | | | | |
| | I Nedelko | 3 | 0 | | | | | | | | C Berlocq | 1 | 6 | 5 | | | | |
| | C Berlocq | 6 | 6 | | | C Berlocq | 3 | 7$^7$ | 6 | | | | | | | | | |
| | JI Londero | 6 | 6 | | | JI Londero | 6 | 6$^1$ | 4 | | | | | | | | | |
| 2 | E Ymer | 1 | 4 | | | | | | | | | | | | | | | |