# 2018 Kunal Patel San Francisco Open – Singles

Zhang Ze was the defending champion but chose not to defend his title.
Jason Jung won the title after defeating Dominik Köpfer 6–4, 2–6, 7–6$^{(7–5)}$ in the final.

## Seeds

* Alexander Bublik (first round)
* Mackenzie McDonald (second round)
* Michael Mmoh (quarterfinals)
* Denis Kudla (second round)
* Bradley Klahn (quarterfinals)
* Noah Rubin (quarterfinals)
* Filip Peliwo (quarterfinals)
* Brayden Schnur (first 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 |
| Dennis Novikov | 3 | 1 | | | | | |
| Dominik Köpfer | 6 | 6 | | | | | |
| Dominik Köpfer | 6 | 6 | | Dominik Köpfer | 4 | 6 | 6$^5$ |
| | | | | Jason Jung | 6 | 2 | 7$^7$ |
| Miomir Kecmanović | 6$^5$ | 6 | 2 | Jason Jung | 6 | 2 | 7$^7$ |
| Jason Jung | 7$^7$ | 4 | 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 |
| 1 | A Bublik | 6$^{10}$ | 6 | 2 | | | | | | | | | | | | |
| | D Novikov | 7$^{12}$ | 3 | 6 | | D Novikov | 5 | 6 | 6 | | | | | | | |
| Q | Karue Sell | 6$^3$ | 6 | 3 | | DE Galán | 7 | 3 | 4 | | | | | | | |
| | DE Galán | 7$^7$ | 3 | 6 | | | | | | | D Novikov | 7 | 7 | | | |
| WC | D Thomas | 7$^7$ | 7$^7$ | | | | | | | 7 | F Peliwo | 5 | 5 | | | |
| | A Collarini | 6$^4$ | 6$^4$ | | WC | D Thomas | 3 | 2 | | | | | | | | |
| Q | M González | 4 | 2 | | 7 | F Peliwo | 6 | 6 | | | | | | | | |
| 7 | F Peliwo | 6 | 6 | | | | | | | | | | | D Novikov | 3 | 1 |
| 4 | D Kudla | 6 | 7$^7$ | | | | | | | | | | | D Köpfer | 6 | 6 |
| | A Pavić | 4 | 6$^4$ | | 4 | D Kudla | 6$^3$ | 3 | | | | | | | | |
| | D Köpfer | 6 | 6 | | | D Köpfer | 7$^7$ | 6 | | | | | | | | |
| | J Šátral | 2 | 2 | | | | | | | | D Köpfer | 6 | 7$^8$ | | | |
| | M Krueger | 6 | 6 | | | | | | | 5 | B Klahn | 2 | 6$^6$ | | | |
| | G Oliveira | 3 | 4 | | | M Krueger | 7$^7$ | 4 | 4 | | | | | | | |
| | M Arévalo | 6$^1$ | 3 | | 5 | B Klahn | 6$^4$ | 6 | 6 | | | | | | | |
| 5 | B Klahn | 7$^7$ | 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 | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 8 | B Schnur | 4 | 6$^2$ | | | | | | | | | | | | | | | |
| | M Kecmanović | 6 | 7$^7$ | | | M Kecmanović | 6 | 7$^8$ | | | | | | | | | | |
| Q | JC Aragone | 6 | 4 | 7$^7$ | Q | JC Aragone | 4 | 6$^6$ | | | | | | | | | | |
| | M Giron | 4 | 6 | 6$^5$ | | | | | | | M Kecmanović | 7$^7$ | 6$^4$ | 6 | | | | |
| WC | C Eubanks | 7$^7$ | 4 | | | | | | | 3 | M Mmoh | 6$^3$ | 7$^7$ | 1 | | | | |
| | E Karlovskiy | 6$^4$ | 3$^r$ | | WC | C Eubanks | 4 | 4 | | | | | | | | | | |
| WC | C Garín | 2 | 3 | | 3 | M Mmoh | 6 | 6 | | | | | | | | | | |
| 3 | M Mmoh | 6 | 6 | | | | | | | | | | | | M Kecmanović | 6$^5$ | 6 | 2 |
| 6 | N Rubin | 6 | 3 | | | | | | | | | | | | J Jung | 7$^7$ | 4 | 6 |
| | J Hernández-Fernández | 1 | 0$^r$ | | 6 | N Rubin | 6 | 6 | | | | | | | | | | |
| Q | Jared Hiltzik | 7$^7$ | 4 | 6 | Q | J Hiltzik | 1 | 4 | | | | | | | | | | |
| | K Uchida | 6$^3$ | 6 | 3 | | | | | | 6 | N Rubin | 3 | 1 | | | | | |
| | Í Cervantes | 2 | 0 | | | | | | | | J Jung | 6 | 6 | | | | | |
| | J Jung | 6 | 6 | | | J Jung | 1 | 7$^7$ | 6 | | | | | | | | | |
| WC | F Lakat | 4 | 4 | | 2 | M McDonald | 6 | 6$^3$ | 2 | | | | | | | | | |
| 2 | M McDonald | 6 | 6 | | | | | | | | | | | | | | | |