# 2018 Gwangju Open – Singles

Matthias Bachinger was the defending champion but chose not to defend his title.
Maverick Banes won the title after defeating Nam Ji-sung 6–3, 4–6, 6–4 in the final.

## Seeds

* Marcel Granollers (first round)
* Henri Laaksonen (first round)
* Alexander Bublik (semifinals)
* Lee Duck-hee (quarterfinals)
* Akira Santillan (quarterfinals)
* Maverick Banes (champion)
* Ulises Blanch (first round, retired)
* Renta Tokuda (quarterfinals, retired)

## 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 | Final |
| 6 | Maverick Banes | 6 | 6 | | | | | |
| | Makoto Ochi | 4 | 4 | | | | | |
| | Makoto Ochi | 4 | 4 | 6 | Maverick Banes | 6 | 4 | 6 |
| | | | | Q | Nam Ji-sung | 3 | 6 | 4 |
| 3 | Alexander Bublik | 6$^7$ | 5 | Q | Nam Ji-sung | 3 | 6 | 4 |
| Q | Nam Ji-sung | 7$^9$ | 7 | | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1/Alt | M Granollers | 4 | 3 | | | | | | | | | | | | | |
| | A Popyrin | 6 | 6 | | | A Popyrin | 7$^7$ | 7$^7$ | | | | | | | | |
| | B Mousley | 6 | 6 | | | B Mousley | 6$^5$ | 6$^2$ | | | | | | | | |
| Q | Son Ji-hoon | 3 | 2 | | | | | | | A Popyrin | 4 | 3 | | | | |
| WC | Kim Cheong-eui | 5 | 7$^7$ | 2 | | | | | 6 | M Banes | 6 | 6 | | | | |
| Q | Sidharth Rawat | 7 | 6$^5$ | 6 | Q | S Rawat | 3 | 3 | | | | | | | | |
| WC | Sin Dong-hak | 2 | 1 | | 6 | M Banes | 6 | 6 | | | | | | | | |
| 6 | M Banes | 6 | 6 | | | | | | | | | | 6 | M Banes | 6 | 6 |
| 4 | D-h Lee | 7$^7$ | 6 | | | | | | | | | | | M Ochi | 4 | 4 |
| WC | Ho Chung | 6$^4$ | 2 | | 4 | D-h Lee | 6 | 6 | | | | | | | | |
| WC | Jeong Yeong-seok | 4 | 0 | | | R Statham | 4 | 3 | | | | | | | | |
| | R Statham | 6 | 6 | | | | | | 4 | D-h Lee | 2 | 1 | | | | |
| | L Catarina | 3 | 2 | | | | | | | M Ochi | 6 | 6 | | | | |
| | Makoto Ochi | 6 | 6 | | | M Ochi | 7 | 6 | | | | | | | | |
| | B Ellis | 6 | 0 | | | B Ellis | 5 | 1 | | | | | | | | |
| 7 | U Blanch | 3 | 1$^r$ | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 8 | Renta Tokuda | 3 | 6 | 6 | | | | | | | | | | | | |
| | S Mukund | 6 | 2 | 3 | 8 | R Tokuda | 7$^7$ | 6 | | | | | | | | |
| | R Safiullin | 6 | 2 | | | R Safiullin | 6$^3$ | 2 | | | | | | | | |
| Q | Y He | 2 | 0$^r$ | | | | | | 8 | R Tokuda | 1$^r$ | | | | | |
| | Y-s Chung | 4 | 6 | 3 | | | | | 3 | A Bublik | 3 | | | | | |
| | B Lock | 6 | 4 | 6 | | B Lock | 2 | 5 | | | | | | | | |
| | A Kadhe | 6 | 6$^6$ | 6$^2$ | 3 | A Bublik | 6 | 7 | | | | | | | | |
| 3 | A Bublik | 4 | 7$^8$ | 7$^7$ | | | | | | | | | 3 | A Bublik | 6$^7$ | 5 |
| 5 | A Santillan | 6 | 3 | | | | | | | | | | Q | J-s Nam | 7$^9$ | 7 |
| | G Granollers | 1 | 1$^r$ | | 5 | A Santillan | 6 | 6 | | | | | | | | |
| | Hiroyasu Ehara | 1 | 6$^1$ | | | K-M Maamoun | 3 | 2 | | | | | | | | |
| | K-M Maamoun | 6 | 7$^7$ | | | | | | 5 | A Santillan | 2 | 3 | | | | |
| | Y Takahashi | 2 | 6 | 2 | | | | | Q | J-s Nam | 6 | 6 | | | | |
| SE | Xia Zihao | 6 | 1 | 6 | SE | Z Xia | 2 | 3 | | | | | | | | |
| Q | J-s Nam | 6 | 6 | | Q | J-s Nam | 6 | 6 | | | | | | | | |
| 2 | H Laaksonen | 1 | 1 | | | | | | | | | | | | | |