# 2018 Banja Luka Challenger – Singles

Maximilian Marterer was the defending champion but chose not to defend his title.
Alessandro Giannessi won the title after defeating Carlos Berlocq 6–7$^{(6–8)}$, 6–4, 6–4 in the final.

## Seeds

* Juan Ignacio Londero (quarterfinals)
* Pablo Andújar (quarterfinals)
* Marco Trungelliti (first round)
* Daniel Gimeno Traver (quarterfinals)
* Andrej Martin (first round)
* Christian Garín (second round, withdrew)
* Carlos Berlocq (final)
* Pedro Martínez (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 | Final | Final | Final | Final | Final |
| | Filippo Baldi | 6$^3$ | 4 | | | | | |
| | Alessandro Giannessi | 7$^7$ | 6 | | | | | |
| | Alessandro Giannessi | 7$^7$ | 6 | | Alessandro Giannessi | 6$^6$ | 6 | 6 |
| | | | | 7 | Carlos Berlocq | 7$^8$ | 4 | 4 |
| | Johan Tatlot | 2 | 4 | 7 | Carlos Berlocq | 7$^8$ | 4 | 4 |
| 7 | Carlos Berlocq | 6 | 6 | | | | | |

### 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 | Quarterfinals | Semifinals | Semifinals | Semifinals |
| 1 | JI Londero | 5 | 6 | 5 | | | | | | | | | | | | | |
| Q | A Karatsev | 7 | 3 | 3$^r$ | 1 | JI Londero | 6 | 6 | | | | | | | | | |
| Q | F Coria | 6 | 6 | | Q | F Coria | 4 | 2 | | | | | | | | | |
| | K Krawietz | 3 | 1 | | | | | | | 1 | JI Londero | 6 | 0 | 5 | | | |
| | F Baldi | 6 | 6 | | | | | | | | F Baldi | 4 | 6 | 7 | | | |
| | K Coppejans | 1 | 4 | | | F Baldi | w/o | | | | | | | | | | |
| WC | Kento Tagashira | 0 | 1 | | 6 | C Garín | | | | | | | | | | | |
| 6 | C Garín | 6 | 6 | | | | | | | | | | | | F Baldi | 6$^3$ | 4 |
| 3 | M Trungelliti | 3 | 3 | | | | | | | | | | | | A Giannessi | 7$^7$ | 6 |
| | L Grigelis | 6 | 6 | | | L Grigelis | 2 | 7$^7$ | 6 | | | | | | | | |
| SE | T Bellucci | 7$^7$ | 6 | | SE | T Bellucci | 6 | 6$^5$ | 3 | | | | | | | | |
| | P Cachin | 6$^2$ | 1 | | | | | | | | L Grigelis | 3 | 4 | | | | |
| | D Kuzmanov | 6 | 7$^7$ | | | | | | | | A Giannessi | 6 | 6 | | | | |
| | A Pavić | 1 | 6$^0$ | | | D Kuzmanov | 6 | 2 | 2 | | | | | | | | |
| | A Giannessi | 6 | 4 | 6 | | A Giannessi | 2 | 6 | 6 | | | | | | | | |
| 5 | A Martin | 4 | 6 | 4 | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 8 | P Martínez | 3 | 4 | | | | | | | | | | | | | |
| | J Tatlot | 6 | 6 | | J Tatlot | 6 | 6 | | | | | | | | | |
| Q | A Lazov | 6 | 6 | Q | A Lazov | 3 | 4 | | | | | | | | | |
| WC | Franjo Raspudić | 4 | 1 | | | | | | J Tatlot | 4 | 7 | 7 | | | | |
| | R Ojeda Lara | 6 | 6 | | | | | 4 | D Gimeno Traver | 6 | 5 | 5 | | | | |
| WC | M Zekić | 4 | 4 | | R Ojeda Lara | 4 | 2 | | | | | | | | | |
| | F Horanský | 1 | 6$^2$ | 4 | D Gimeno Traver | 6 | 6 | | | | | | | | | |
| 4 | D Gimeno Traver | 6 | 7$^7$ | | | | | | | | | | | J Tatlot | 2 | 4 |
| 7 | C Berlocq | 6 | 6 | | | | | | | | | | 7 | C Berlocq | 6 | 6 |
| WC | M Miladinović | 2 | 1 | 7 | C Berlocq | 6 | 6 | | | | | | | | | |
| | O Roca Batalla | 6 | 6 | | O Roca Batalla | 4 | 4 | | | | | | | | | |
| | I Nedelko | 0 | 4 | | | | | 7 | C Berlocq | 3 | 6 | 6 | | | | |
| | B Zapata Miralles | 6 | 6 | | | | | 2 | P Andújar | 6 | 4 | 1 | | | | |
| | G Mager | 4 | 1 | | B Zapata Miralles | 4 | 5 | | | | | | | | | |
| Q | A Vavassori | 0 | 1 | 2 | P Andújar | 6 | 7 | | | | | | | | | |
| 2 | P Andújar | 6 | 6 | | | | | | | | | | | | | |