# 2018 Los Cabos Open – Singles

Sam Querrey was the defending champion, but lost in the second round to Egor Gerasimov.
Fabio Fognini won the title, defeating Juan Martín del Potro in the final, 6–4, 6–2.

## Seeds

The top four seeds received a bye into the second round.
* Juan Martín del Potro (final)
* Fabio Fognini (champion)
* Damir Džumhur (semifinals)
* Adrian Mannarino (quarterfinals)
* Sam Querrey (second round)
* Ryan Harrison (withdrew)
* Taylor Fritz (second round)
* Feliciano López (second 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 |
| 1 | Juan Martín del Potro | 6 | 7$^8$ | | | | |
| 3 | Damir Džumhur | 3 | 6$^6$ | | | | |
| 3 | Damir Džumhur | 3 | 6$^6$ | 1 | Juan Martín del Potro | 4 | 2 |
| | | | | 2 | Fabio Fognini | 6 | 6 |
| | Cameron Norrie | 4 | 2 | 2 | Fabio Fognini | 6 | 6 |
| 2 | Fabio Fognini | 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 | Semifinals | Semifinals | Semifinals | Semifinals |
| | | | | | 1 | JM del Potro | 7 | 6 | | | | | | | | | |
| Q | M Giron | 6 | 7 | | Q | M Giron | 5 | 3 | | | | | | | | | |
| | M Arévalo | 2 | 5 | | | | | | | 1 | JM del Potro | 6 | 6 | | | | |
| | B Tomic | 4 | 3 | | | | | | | PR | E Gerasimov | 1 | 1 | | | | |
| PR | E Gerasimov | 6 | 6 | | PR | E Gerasimov | 7 | 5 | 7$^8$ | | | | | | | | |
| WC | L Gómez | 2 | 3 | | 5 | S Querrey | 5 | 7 | 6$^6$ | | | | | | | | |
| 5 | S Querrey | 6 | 6 | | | | | | | | | | | 1 | JM del Potro | 6 | 7$^8$ |
| | | | | | | | | | | | | | | 3 | D Džumhur | 3 | 6$^6$ |
| | | | | | 3 | D Džumhur | 7$^7$ | 7$^7$ | | | | | | | | | |
| | T Fabbiano | 5 | 6 | 7 | | T Fabbiano | 6$^0$ | 6$^5$ | | | | | | | | | |
| Q | T Garanganga | 7 | 2 | 5 | | | | | | 3 | D Džumhur | 6 | 6 | | | | |
| WC | E Escobedo | 3 | 6 | 1 | | | | | | | M Mmoh | 2 | 3 | | | | |
| | M Mmoh | 6 | 4 | 6 | | M Mmoh | 7$^7$ | 7$^7$ | | | | | | | | | |
| | P Polansky | 6 | 3 | 6 | | P Polansky | 6$^1$ | 6$^2$ | | | | | | | | | |
| LL | DE Galán | 4 | 6 | 2 | | | | | | | | | | | | | |

### Bottom half

| 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 López | 7$^7$ | 6 | | | | | | | | | | | | | |
| Q | M Safwat | 6$^3$ | 4 | 8 | F López | 3 | 3 | | | | | | | | | |
| | C Norrie | 6 | 6 | | C Norrie | 6 | 6 | | | | | | | | | |
| Q | P Gunneswaran | 2 | 2 | | | | | | | C Norrie | 6 | 6 | | | | |
| | I Karlović | 4 | 3 | | | | | | 4 | A Mannarino | 4 | 4 | | | | |
| | E Ymer | 6 | 6 | | E Ymer | 0 | 2 | | | | | | | | | |
| | | | | 4 | A Mannarino | 6 | 6 | | | | | | | | | |
| | | | | | | | | | | | | | | C Norrie | 4 | 2 |
| 7 | T Fritz | 7$^8$ | 7$^7$ | | | | | | | | | | 2 | F Fognini | 6 | 6 |
| WC | T Kokkinakis | 6$^6$ | 6$^5$ | 7 | T Fritz | 6$^3$ | 1 | | | | | | | | | |
| | G Elias | 4 | 3 | PR | Y Nishioka | 7$^7$ | 6 | | | | | | | | | |
| PR | Y Nishioka | 6 | 6 | | | | | | PR | Y Nishioka | 2 | 2 | | | | |
| | G Müller | 4 | 4 | | | | | | 2 | F Fognini | 6 | 6 | | | | |
| | Q Halys | 6 | 6 | | Q Halys | 6 | 4 | 0 | | | | | | | | |
| | | | | 2 | F Fognini | 2 | 6 | 6 | | | | | | | | |

## Qualifying
### Seeds

* Daniel Elahi Galán (qualifying competition, lucky loser)
* Mohamed Safwat (qualified)
* Prajnesh Gunneswaran (qualified)
* Evan King (first round)
* Bradley Mousley (first round)
* Evan Song (qualifying competition)
* Aleksandar Vukic (qualifying competition)
* Austin Krajicek (first round)

### Qualifiers

* Marcos Giron
* Mohamed Safwat
* Prajnesh Gunneswaran
* Takanyi Garanganga

### Lucky loser

* Daniel Elahi Galán

### Qualifying draw
#### First qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| | | | | 1 | Daniel Elahi Galán | 2 | 5 |
| | | | | | Marcos Giron | 6 | 7 |
| | Marcos Giron | 6 | 6 | | Marcos Giron | 6 | 7 |
| 5 | Bradley Mousley | 4 | 3 | | | | |

#### Second qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 2 | Mohamed Safwat | 6 | 6 | | | | | | |
| WC | Alan Magadán | 2 | 0 | | | | | | |
| WC | Alan Magadán | 2 | 0 | | 2 | Mohamed Safwat | 2 | 7$^7$ | 6 |
| | | | | | 7 | Aleksandar Vukic | 6 | 6$^2$ | 4 |
| | Jacob Grills | 6 | 2 | 3 | 7 | Aleksandar Vukic | 6 | 6$^2$ | 4 |
| 7 | Aleksandar Vukic | 3 | 6 | 6 | | | | | |

#### Third qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 3 | Prajnesh Gunneswaran | 6 | 6 | | | | |
| | Miguel Ángel Reyes-Varela | 4 | 0 | | | | |
| | Miguel Ángel Reyes-Varela | 4 | 0 | 3 | Prajnesh Gunneswaran | 6 | 6 |
| | | | | 6 | Evan Song | 3 | 1 |
| | Tigre Hank | 4 | 2 | 6 | Evan Song | 3 | 1 |
| 6 | Evan Song | 6 | 6 | | | | |

#### Fourth qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 4 | Evan King | 6$^2$ | 6 | 6$^5$ | | | | | |
| | Takanyi Garanganga | 7$^7$ | 4 | 7$^7$ | | | | | |
| | Takanyi Garanganga | 7$^7$ | 4 | 7$^7$ | | Takanyi Garanganga | 6 | 0 | 7$^9$ |
| | | | | | WC | Luis Patiño | 2 | 6 | 6$^7$ |
| WC | Luis Patiño | 6 | 6 | | WC | Luis Patiño | 2 | 6 | 6$^7$ |
| 8 | Austin Krajicek | 4 | 4 | | | | | | |