# 2018 Morelos Open – Singles

Alexander Bublik was the defending champion but chose not to defend his title.
Dennis Novikov won the title after defeating Cristian Garín 6–4, 6–3 in the final.

## Seeds

* Andrej Martin (quarterfinals)
* Kevin King (quarterfinals)
* Dennis Novikov (champion)
* Evan King (second round)
* Marcelo Arévalo (first round)
* Thanasi Kokkinakis (semifinals, withdrew)
* Peđa Krstin (semifinals)
* Dmitry Popko (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 | Final | Final | Final | Final |
| 6/WC | Thanasi Kokkinakis | | | | | | |
| | Cristian Garín | w/o | | | | | |
| | Cristian Garín | w/o | | | Cristian Garín | 4 | 3 |
| | | | | 3 | Dennis Novikov | 6 | 6 |
| 3 | Dennis Novikov | 6 | 6 | 3 | Dennis Novikov | 6 | 6 |
| 7 | Peđa Krstin | 1 | 4 | | | | |

### 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 | A Martin | 6 | 5 | 7 | | | | | | | | | | | | |
| | R Quiroz | 2 | 7 | 5 | 1 | A Martin | 6 | 6 | | | | | | | | |
| | C Eubanks | 6 | 6 | | | C Eubanks | 4 | 2 | | | | | | | | |
| | N Scholtz | 3 | 4 | | | | | | 1 | A Martin | 6 | 6$^7$ | 2 | | | |
| | DE Galán | 6 | 0 | | | | | | 6/WC | T Kokkinakis | 3 | 7$^9$ | 6 | | | |
| | J Hernández-Fernández | 1 | 0$^r$ | | | DE Galán | 6$^4$ | 5 | | | | | | | | |
| | Carlos Boluda-Purkiss | 2 | 6$^4$ | | 6/WC | T Kokkinakis | 7$^7$ | 7 | | | | | | | | |
| 6/WC | T Kokkinakis | 6 | 7$^7$ | | | | | | | | | | | 6/WC | T Kokkinakis | |
| 4 | E King | 6$^1$ | 6 | 6 | | | | | | | | | | | C Garín | w/o |
| | R Statham | 7$^7$ | 3 | 3 | 4 | E King | 3 | 6$^4$ | | | | | | | | |
| | M Matosevic | 2 | 4 | | | C Garín | 6 | 7$^7$ | | | | | | | | |
| | C Garín | 6 | 6 | | | | | | | C Garín | 6 | 3 | 6 | | | |
| WC | L Patiño | 0 | 2 | | | | | | 8 | D Popko | 1 | 6 | 1 | | | |
| | A González | 6 | 6 | | | A González | 1 | 3 | | | | | | | | |
| | S Diez | 6 | 2 | 2 | 8 | D Popko | 6 | 6 | | | | | | | | |
| 8 | D Popko | 4 | 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 |
| 5 | M Arévalo | 4 | 7 | 6$^6$ | | | | | | | | | | | | | |
| Q | S Fanselow | 6 | 5 | 7$^8$ | Q | S Fanselow | 4 | 4 | | | | | | | | | |
| | A Sarkissian | 6 | 6 | | | A Sarkissian | 6 | 6 | | | | | | | | | |
| WC | M Sánchez | 4 | 4 | | | | | | | | A Sarkissian | 1 | 6$^4$ | | | | |
| | J Choinski | 4 | 3 | | | | | | | 3 | D Novikov | 6 | 7$^7$ | | | | |
| | A Pavić | 6 | 6 | | | A Pavić | 4 | 6$^7$ | | | | | | | | | |
| | R Ortega Olmedo | 6$^2$ | 7 | 4 | 3 | D Novikov | 6 | 7$^9$ | | | | | | | | | |
| 3 | D Novikov | 7$^7$ | 5 | 6 | | | | | | | | | | 3 | D Novikov | 6 | 6 |
| 7 | P Krstin | 6 | 6 | | | | | | | | | | | 7 | P Krstin | 1 | 4 |
| WC | T Hank | 3 | 0 | | 7 | P Krstin | 6$^5$ | 6 | 6 | | | | | | | | |
| | A Krajicek | 5 | 0$^r$ | | Q | R Cid Subervi | 7$^7$ | 3 | 0 | | | | | | | | |
| Q | R Cid Subervi | 7 | 1 | | | | | | | 7 | P Krstin | 6 | 6 | | | | |
| | M Vilella Martínez | 4 | 6 | 4 | | | | | | 2 | K King | 4 | 4 | | | | |
| Q | G López Villaseñor | 6 | 4 | 6 | Q | G López Villaseñor | 1 | 1 | | | | | | | | | |
| Q | E Gómez | 4 | 3 | | 2 | K King | 6 | 6 | | | | | | | | | |
| 2 | K King | 6 | 6 | | | | | | | | | | | | | | |