# 2018 Challenger ATP Cachantún Cup – Singles

Rogério Dutra Silva was the defending champion but lost in the quarterfinals to Carlos Gómez-Herrera.
Marco Cecchinato won the title after defeating Gómez-Herrera 1–6, 6–1, 6–1 in the final.

## Seeds

* Gastão Elias (second round)
* Marco Cecchinato (champion)
* Rogério Dutra Silva (quarterfinals)
* Pedro Sousa (first round)
* Andrej Martin (first round)
* Thiago Monteiro (first round)
* Carlos Berlocq (withdrew)
* Thomaz Bellucci (quarterfinals)

## 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 | Final |
| | Jozef Kovalík | 3 | 6$^1$ | | | | | | |
| Q | Carlos Gómez-Herrera | 6 | 7$^7$ | | | | | | |
| Q | Carlos Gómez-Herrera | 6 | 7$^7$ | | Q | Carlos Gómez-Herrera | 6 | 1 | 1 |
| | | | | | 2 | Marco Cecchinato | 1 | 6 | 6 |
| | Tommy Robredo | 6 | 1 | 4 | 2 | Marco Cecchinato | 1 | 6 | 6 |
| 2 | Marco Cecchinato | 4 | 6 | 6 | | | | | |

### 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 | Semifinals |
| 1 | G Elias | 7$^7$ | 6 | | | | | | | | | | | | | | |
| WC | MT Barrios Vera | 6$^5$ | 4 | | 1 | G Elias | 6$^4$ | 2 | | | | | | | | | |
| | J Kovalík | 6 | 2 | 6 | | J Kovalík | 7$^7$ | 6 | | | | | | | | | |
| | A Giannessi | 3 | 6 | 2 | | | | | | J Kovalík | 6$^6$ | 7$^7$ | 6 | | | | |
| | E López Pérez | 6 | 3 | 5 | | | | | 8 | T Bellucci | 7$^8$ | 6$^4$ | 3 | | | | |
| | R Olivo | 3 | 6 | 7 | | R Olivo | 1 | 4 | | | | | | | | | |
| Q | F Argüello | 2 | 3 | | 8 | T Bellucci | 6 | 6 | | | | | | | | | |
| 8 | T Bellucci | 6 | 6 | | | | | | | | | | | | J Kovalík | 3 | 6$^1$ |
| 3 | R Dutra Silva | 7$^7$ | 6 | | | | | | | | | | | Q | C Gómez-Herrera | 6 | 7$^7$ |
| | J Domingues | 6$^2$ | 4 | | 3 | R Dutra Silva | 6 | 6 | | | | | | | | | |
| LL | H Casanova | 7 | 3 | 6 | LL | H Casanova | 3 | 4 | | | | | | | | | |
| WC | A Tabilo | 5 | 6 | 4 | | | | | 3 | R Dutra Silva | 6 | 3 | 3 | | | | |
| | F Bagnis | 7$^7$ | 6 | | | | | | Q | C Gómez-Herrera | 4 | 6 | 6 | | | | |
| | C Moutet | 6$^1$ | 1 | | | F Bagnis | 1 | 3 | | | | | | | | | |
| LL | J Souza | 3 | 1 | | Q | C Gómez-Herrera | 6 | 6 | | | | | | | | | |
| Q | C Gómez-Herrera | 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 | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 6 | T Monteiro | 2 | 3 | | | | | | | | | | | | | | | | |
| Q | GM Moroni | 6 | 6 | | Q | GM Moroni | 6 | 6 | | | | | | | | | | | |
| | S Ofner | 6 | 2 | 6 | | S Ofner | 2 | 1 | | | | | | | | | | | |
| WC | G Lama | 4 | 6 | 4 | | | | | | Q | GM Moroni | 7$^8$ | 3 | 0 | | | | | |
| | M Bourgue | 4 | 6 | 2 | | | | | | | T Robredo | 6$^6$ | 6 | 6 | | | | | |
| WC | C Garín | 6 | 4 | 6 | WC | C Garín | 3 | 6 | 1 | | | | | | | | | | |
| | T Robredo | 6 | 7 | | | T Robredo | 6 | 4 | 6 | | | | | | | | | | |
| 4 | P Sousa | 4 | 5 | | | | | | | | | | | | | T Robredo | 6 | 1 | 4 |
| 5 | A Martin | 4 | 0 | | | | | | | | | | | | 2 | M Cecchinato | 4 | 6 | 6 |
| | G Andreozzi | 6 | 6 | | | G Andreozzi | 6 | 6 | | | | | | | | | | | |
| Alt | P Krstin | 6 | 3 | 6 | Alt | P Krstin | 3 | 4 | | | | | | | | | | | |
| | A De Greef | 3 | 6 | 0 | | | | | | | G Andreozzi | 1 | 2 | | | | | | |
| | C Taberner | 6 | 7 | | | | | | | 2 | M Cecchinato | 6 | 6 | | | | | | |
| Q | P Cachin | 4 | 5 | | | C Taberner | 3 | 6 | 4 | | | | | | | | | | |
| | S Bolelli | 3 | 5 | | 2 | M Cecchinato | 6 | 2 | 6 | | | | | | | | | | |
| 2 | M Cecchinato | 6 | 7 | | | | | | | | | | | | | | | | |