# 2018 Karshi Challenger – Singles

Egor Gerasimov was the defending champion and successfully defended his title.
Gerasimov won the title after Sergey Betov retired trailing 6–7$^{(3–7)}$, 0–2 in the final.

## Seeds

* Hubert Hurkacz (first round, retired)
* Nikola Milojević (second round)
* Egor Gerasimov (champion)
* Uladzimir Ignatik (quarterfinals)
* Aleksandr Nedovyesov (second round, retired)
* Lloyd Harris (quarterfinals)
* Aldin Šetkić (second round)
* Yang Tsung-hua (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 |
| | Carlos Boluda-Purkiss | 6$^3$ | 1 | | | | |
| Q | Sergey Betov | 7$^7$ | 6 | | | | |
| Q | Sergey Betov | 7$^7$ | 6 | Q | Sergey Betov | 6$^3$ | 0$^r$ |
| | | | | 3 | Egor Gerasimov | 7$^7$ | 2 |
| 3 | Egor Gerasimov | 7$^7$ | 7$^7$ | 3 | Egor Gerasimov | 7$^7$ | 2 |
| | Cem İlkel | 6$^4$ | 6$^4$ | | | | |

### 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 | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | H Hurkacz | 6$^6$ | 2$^r$ | | | | | | | | | | | | | | |
| | M Vilella Martínez | 7$^8$ | 5 | | | M Vilella Martínez | 1 | 5 | | | | | | | | | |
| | K Kravchuk | 6$^3$ | 3 | | WC | K Sultanov | 6 | 7 | | | | | | | | | |
| WC | K Sultanov | 7$^7$ | 6 | | | | | | | WC | K Sultanov | 6$^3$ | 4 | | | | |
| | E Tyurnev | 5 | 6 | 2 | | | | | | | C Boluda-Purkiss | 7$^7$ | 6 | | | | |
| | Carlos Boluda-Purkiss | 7 | 3 | 6 | | C Boluda-Purkiss | 6 | 5 | 7$^9$ | | | | | | | | |
| | A Bega | 4 | 4 | | 8 | T-h Yang | 4 | 7 | 6$^7$ | | | | | | | | |
| 8 | T-h Yang | 6 | 6 | | | | | | | | | | | | C Boluda-Purkiss | 6$^3$ | 1 |
| 4 | U Ignatik | 6 | 6 | | | | | | | | | | | Q | S Betov | 7$^7$ | 6 |
| WC | S Fomin | 3 | 3 | | 4 | U Ignatik | 6 | 6 | | | | | | | | | |
| | K Uchida | 1 | 6 | 6 | | K Uchida | 3 | 3 | | | | | | | | | |
| | H Moriya | 6 | 2 | 3 | | | | | | 4 | U Ignatik | 3 | 6$^1$ | | | | |
| WC | J Karimov | 6$^4$ | 3 | | | | | | | Q | S Betov | 6 | 7$^7$ | | | | |
| Q | S Betov | 7$^7$ | 6 | | Q | S Betov | 6 | 4 | 7$^7$ | | | | | | | | |
| Q | Shuichi Sekiguchi | 1 | 5 | | 7 | A Šetkić | 4 | 6 | 6$^4$ | | | | | | | | |
| 7 | A Šetkić | 6 | 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 |
| 6 | L Harris | 7$^7$ | 1 | 6 | | | | | | | | | | | | | | |
| | I Gakhov | 6$^5$ | 6 | 3 | 6 | L Harris | 3 | 7$^7$ | 6 | | | | | | | | | |
| | R Ortega Olmedo | 7$^7$ | 6 | | | R Ortega Olmedo | 6 | 6$^4$ | 3 | | | | | | | | | |
| Q | T Lamasine | 6$^3$ | 4 | | | | | | | 6 | L Harris | 1 | 6 | 3 | | | | |
| | T Gabashvili | 6 | 6 | | | | | | | 3 | E Gerasimov | 6 | 3 | 6 | | | | |
| | JC Aragone | 2 | 4 | | | T Gabashvili | 4 | 6$^5$ | | | | | | | | | | |
| WC | F Dustov | 3 | 4 | | 3 | E Gerasimov | 6 | 7$^7$ | | | | | | | | | | |
| 3 | E Gerasimov | 6 | 6 | | | | | | | | | | | | 3 | E Gerasimov | 7$^7$ | 7$^7$ |
| 5 | A Nedovyesov | 7$^7$ | 7 | | | | | | | | | | | | | C İlkel | 6$^4$ | 6$^4$ |
| | A Basso | 6$^5$ | 5 | | 5 | A Nedovyesov | 6 | 3 | 0$^r$ | | | | | | | | | |
| | C İlkel | 6 | 7$^7$ | | | C İlkel | 3 | 6 | 4 | | | | | | | | | |
| | Jared Hiltzik | 2 | 6$^4$ | | | | | | | | C İlkel | 3 | 6 | 6 | | | | |
| | S Fayziev | 6 | 2 | 6$^4$ | | | | | | Q | S Mukund | 6 | 2 | 3 | | | | |
| Q | S Mukund | 4 | 6 | 7$^7$ | Q | S Mukund | 6 | 0 | 6 | | | | | | | | | |
| | R Safiullin | 4 | 2 | | 2 | N Milojević | 3 | 6 | 2 | | | | | | | | | |
| 2 | N Milojević | 6 | 6 | | | | | | | | | | | | | | | |