# 2018 Lima Challenger – Singles

Gerald Melzer was the defending champion but lost in the first round to Paolo Lorenzi.
Christian Garín won the title after defeating Pedro Sousa 6–4, 6–4 in the final.

## Seeds

* Pablo Cuevas (first round)
* Federico Delbonis (quarterfinals, withdrew)
* Guido Andreozzi (second round)
* Christian Garín (champion)
* Pablo Andújar (second round)
* Thiago Monteiro (semifinals)
* Paolo Lorenzi (second round)
* Hugo Dellien (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 |
| | Pedro Sousa | 7$^8$ | 6 | | | | | |
| | Facundo Argüello | 6$^6$ | 3 | | | | | |
| | Facundo Argüello | 6$^6$ | 3 | | | Pedro Sousa | 4 | 4 |
| | | | | | 4 | Christian Garín | 6 | 6 |
| 4 | Christian Garín | 3 | 6 | 6 | 4 | Christian Garín | 6 | 6 |
| 6 | Thiago Monteiro | 6 | 4 | 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 | Semifinals | Semifinals | Semifinals |
| 1 | P Cuevas | 6$^6$ | 4 | | | | | | | | | | | | |
| | J Domingues | 7$^8$ | 6 | | | J Domingues | 3 | 6 | 4 | | | | | | |
| | A De Greef | 3 | 3 | | | P Sousa | 6 | 3 | 6 | | | | | | |
| | P Sousa | 6 | 6 | | | | | | | P Sousa | 6 | 6 | | | |
| | G Elias | 1 | 6$^5$ | | | | | | | JI Londero | 0 | 3 | | | |
| | JI Londero | 6 | 7$^7$ | | | JI Londero | 6 | 6 | | | | | | | |
| | R Cid Subervi | 3 | 3 | | 5 | P Andújar | 4 | 2 | | | | | | | |
| 5 | P Andújar | 6 | 6 | | | | | | | | | | P Sousa | 7$^8$ | 6 |
| 3 | G Andreozzi | 4 | 6 | 1 | | | | | | | | | F Argüello | 6$^6$ | 3 |
| | R Dutra Silva | 6 | 1 | 0$^r$ | 3 | G Andreozzi | 2 | 6$^4$ | | | | | | | |
| | T Bellucci | 6 | 6$^5$ | 4 | | J Hernández-Fernández | 6 | 7$^7$ | | | | | | | |
| | J Hernández-Fernández | 1 | 7$^7$ | 6 | | | | | | J Hernández-Fernández | 1 | 2 | | | |
| WC | JP Varillas | 4 | 1 | | | | | | | F Argüello | 6 | 6 | | | |
| | F Argüello | 6 | 6 | | | F Argüello | 6 | 7$^{13}$ | | | | | | | |
| | G Melzer | 6$^2$ | 6$^3$ | | 7 | P Lorenzi | 4 | 6$^{11}$ | | | | | | | |
| 7 | P Lorenzi | 7$^7$ | 7$^7$ | | | | | | | | | | | | |

### 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 |
| 8 | H Dellien | 6 | 7 | | | | | | | | | | | | | | | | |
| Alt | M Zekić | 4 | 5 | | 8 | H Dellien | 0 | 7$^7$ | 6 | | | | | | | | | | |
| | F Bagnis | 3 | 3 | | Q | A Collarini | 6 | 6$^4$ | 3 | | | | | | | | | | |
| Q | A Collarini | 6 | 6 | | | | | | | 8 | H Dellien | 6 | 4 | 4 | | | | | |
| | G Clezar | 6 | 6 | | | | | | | 4 | C Garín | 2 | 6 | 6 | | | | | |
| WC | Kento Tagashira | 0 | 0 | | | G Clezar | 3 | 3 | | | | | | | | | | | |
| Q | R Olivo | 6 | 1 | 2 | 4 | C Garín | 6 | 6 | | | | | | | | | | | |
| 4 | C Garín | 4 | 6 | 6 | | | | | | | | | | | 4 | C Garín | 3 | 6 | 6 |
| 6 | T Monteiro | 1 | 6 | 7 | | | | | | | | | | | 6 | T Monteiro | 6 | 4 | 4 |
| PR | S Giraldo | 6 | 2 | 5 | 6 | T Monteiro | w/o | | | | | | | | | | | | |
| Q | C Rodríguez | 4 | 6 | 3 | Q | MT Barrios Vera | | | | | | | | | | | | | |
| Q | MT Barrios Vera | 6 | 3 | 6 | | | | | | 6 | T Monteiro | w/o | | | | | | | |
| WC | E Gómez | 6 | 6 | | | | | | | 2 | F Delbonis | | | | | | | | |
| WC | N Álvarez | 4 | 4 | | WC | E Gómez | 2 | 1 | | | | | | | | | | | |
| | P Krstin | 2 | 2 | | 2 | F Delbonis | 6 | 6 | | | | | | | | | | | |
| 2 | F Delbonis | 6 | 6 | | | | | | | | | | | | | | | | |