# 2018 Las Vegas Challenger – Singles

Stefan Kozlov was the defending champion but lost in the first round to Kamil Majchrzak.
Thanasi Kokkinakis won the title after defeating Blaž Rola 6–4, 6–4 in the final.

## Seeds

* Lloyd Harris (second round)
* Adrián Menéndez Maceiras (second round)
* Casper Ruud (semifinals)
* Jason Jung (quarterfinals)
* Noah Rubin (first round)
* Reilly Opelka (withdrew)
* Dominik Köpfer (first round)
* Marcelo Arévalo (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 |
| | Thanasi Kokkinakis | 6 | 6 | | | |
| 3 | Casper Ruud | 4 | 1 | | | |
| 3 | Casper Ruud | 4 | 1 | Thanasi Kokkinakis | 6 | 6 |
| | | | | Blaž Rola | 4 | 4 |
| | John-Patrick Smith | 3 | 5 | Blaž Rola | 4 | 4 |
| | Blaž Rola | 6 | 7 | | | |

### 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 | L Harris | 6 | 6 | | | | | | | | | | | | | | |
| | J Ward | 4 | 4 | | 1 | L Harris | 4 | 3 | | | | | | | | | |
| | T Kokkinakis | 7$^7$ | 6 | | | T Kokkinakis | 6 | 6 | | | | | | | | | |
| WC | A Cozbinov | 6$^5$ | 1 | | | | | | | | T Kokkinakis | 6 | 6 | | | | |
| Q | T Paul | 6 | 7$^7$ | | | | | | | | D King | 1 | 4 | | | | |
| | K King | 1 | 6$^2$ | | Q | T Paul | 4 | 4 | | | | | | | | | |
| | D King | 6 | 6 | | | D King | 6 | 6 | | | | | | | | | |
| 7 | D Köpfer | 4 | 4 | | | | | | | | | | | | T Kokkinakis | 6 | 6 |
| 3 | C Ruud | 6 | 3 | 6 | | | | | | | | | | 3 | C Ruud | 4 | 1 |
| | M Krueger | 3 | 6 | 3 | 3 | C Ruud | 6 | 6 | | | | | | | | | |
| LL | E King | 6 | 6 | | LL | E King | 3 | 2 | | | | | | | | | |
| | T Robredo | 3 | 4 | | | | | | | 3 | C Ruud | 7 | 7 | | | | |
| | K Majchrzak | 6 | 6 | | | | | | | | K Majchrzak | 5 | 5 | | | | |
| | S Kozlov | 0 | 2 | | | K Majchrzak | 2 | 6 | 6 | | | | | | | | |
| | JC Aragone | 2 | 6 | 6$^3$ | 8 | M Arévalo | 6 | 1 | 4 | | | | | | | | |
| 8 | M Arévalo | 6 | 4 | 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 | Semifinals | Semifinals | Semifinals |
| LL | J Sels | 7$^7$ | 5 | 4 | | | | | | | | | | | | |
| | J-P Smith | 6$^4$ | 7 | 6 | | J-P Smith | 6 | 6 | | | | | | | | |
| WC | M Torpegaard | 4 | 6 | 6$^6$ | | C İlkel | 3 | 1 | | | | | | | | |
| | C İlkel | 6 | 3 | 7$^8$ | | | | | | | J-P Smith | 7$^7$ | 6 | | | |
| Alt | J Choinski | 3 | 4 | | | | | | | 4 | J Jung | 6$^3$ | 3 | | | |
| Q | R Ortega Olmedo | 6 | 6 | | Q | R Ortega Olmedo | 4 | 4 | | | | | | | | |
| LL | A Sarkissian | 6$^5$ | 4 | | 4 | J Jung | 6 | 6 | | | | | | | | |
| 4 | J Jung | 7$^7$ | 6 | | | | | | | | | | | J-P Smith | 3 | 5 |
| 5 | N Rubin | 3 | 6 | 3 | | | | | | | | | | B Rola | 6 | 7 |
| | B Rola | 6 | 1 | 6 | | B Rola | 6 | 6 | | | | | | | | |
| Q | T-S Kwiatkowski | 6 | 6 | | Q | T-S Kwiatkowski | 3 | 4 | | | | | | | | |
| WC | Evan Song | 4 | 4 | | | | | | | | B Rola | 6 | 7$^7$ | | | |
| | N Serdarušić | 6$^4$ | 4 | | | | | | | Q | M Bourgue | 4 | 6$^1$ | | | |
| Q | M Bourgue | 7$^7$ | 6 | | Q | M Bourgue | 6 | 0 | 6 | | | | | | | |
| WC | J. J. Wolf | 3 | 3 | | 2 | A Menéndez Maceiras | 4 | 6 | 3 | | | | | | | |
| 2 | A Menéndez Maceiras | 6 | 6 | | | | | | | | | | | | | |