# 2018 Challenger de Buenos Aires – Singles

Nicolás Kicker was the defending champion but was suspended from tennis due to match-fixing.
Pablo Andújar won the title after defeating Pedro Cachin 6–3, 6–1 in the final.

## Seeds

* Guido Andreozzi (first round)
* Pablo Andújar (champion)
* Thiago Monteiro (first round)
* Pedro Sousa (first round, retired)
* Hugo Dellien (second round)
* Carlos Berlocq (first round)
* Gianluigi Quinzi (second round)
* Facundo Bagnis (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 |
| | Dimitar Kuzmanov | 3 | 6$^6$ | | | | |
| | Pedro Cachin | 6 | 7$^8$ | | | | |
| | Pedro Cachin | 6 | 7$^8$ | | Pedro Cachin | 3 | 1 |
| | | | | 2 | Pablo Andújar | 6 | 6 |
| Q | Federico Coria | 6$^5$ | 5 | 2 | Pablo Andújar | 6 | 6 |
| 2 | Pablo Andújar | 7$^7$ | 7 | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals |
| 1 | G Andreozzi | 6$^5$ | 4 | | | | | | | | | | | | | |
| Q | Bastián Malla | 7$^7$ | 6 | | Q | B Malla | 6 | 6 | | | | | | | | |
| | D Gimeno Traver | 7$^8$ | 5 | 6 | | D Gimeno Traver | 2 | 4 | | | | | | | | |
| | F Gaio | 6$^6$ | 7 | 3 | | | | | Q | B Malla | 4 | 2 | | | | |
| | D Kuzmanov | 5 | 6 | 6 | | | | | | D Kuzmanov | 6 | 6 | | | | |
| Alt | A Collarini | 7 | 1 | 1 | | D Kuzmanov | 6 | 6 | | | | | | | | |
| | T Bellucci | 4 | 6 | 3 | 7 | G Quinzi | 2 | 3 | | | | | | | | |
| 7 | G Quinzi | 6 | 4 | 6 | | | | | | | | | | D Kuzmanov | 3 | 6$^6$ |
| 3 | T Monteiro | 0 | 3 | | | | | | | | | | | P Cachin | 6 | 7$^8$ |
| | P Cachin | 6 | 6 | | | P Cachin | 6 | 6 | | | | | | | | |
| Q | O Luz | 6 | 3 | 6 | Q | O Luz | 2 | 1 | | | | | | | | |
| WC | F Cerúndolo | 3 | 6 | 4 | | | | | | P Cachin | 6 | 4 | 6 | | | |
| | F Argüello | 6 | 6 | | | | | | | F Argüello | 1 | 6 | 4 | | | |
| WC | R Olivo | 1 | 2 | | | F Argüello | 6 | 6 | | | | | | | | |
| Q | G Villanueva | 4 | 3 | | 5 | H Dellien | 4 | 4 | | | | | | | | |
| 5 | H Dellien | 6 | 6 | | | | | | | | | | | | | |

### 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 | Semifinals | Semifinals | Semifinals | Semifinals |
| 8 | F Bagnis | 4 | 6 | 6$^5$ | | | | | | | | | | | | | |
| | M Cuevas | 6 | 4 | 7$^7$ | | M Cuevas | 4 | 1 | | | | | | | | | |
| | M Zekić | 3 | 2 | | | G Clezar | 6 | 6 | | | | | | | | | |
| | G Clezar | 6 | 6 | | | | | | | | G Clezar | 6$^5$ | 5 | | | | |
| Q | F Coria | 6 | 6 | | | | | | | Q | F Coria | 7$^7$ | 7 | | | | |
| | D Dima | 2 | 1 | | Q | F Coria | 2 | 6 | 7 | | | | | | | | |
| | J Domingues | 4 | | | | J Domingues | 6 | 3 | 5 | | | | | | | | |
| 4 | P Sousa | 3$^r$ | | | | | | | | | | | | Q | F Coria | 6$^5$ | 5 |
| 6 | C Berlocq | 5 | 6$^1$ | | | | | | | | | | | 2 | P Andújar | 7$^7$ | 7 |
| | M Vilella Martínez | 7 | 7$^7$ | | | M Vilella Martínez | 5$^r$ | | | | | | | | | | |
| WC | JP Ficovich | 6 | 3 | 6$^4$ | | P Krstin | 5 | | | | | | | | | | |
| | P Krstin | 3 | 6 | 7$^7$ | | | | | | | P Krstin | 5 | 4 | | | | |
| | A De Greef | 6 | 6 | | | | | | | 2 | P Andújar | 7 | 6 | | | | |
| | G Elias | 4 | 3 | | | A De Greef | 1 | 2 | | | | | | | | | |
| WC | F Mena | 2 | 1 | | 2 | P Andújar | 6 | 6 | | | | | | | | | |
| 2 | P Andújar | 6 | 6 | | | | | | | | | | | | | | |