# 2017 Gimcheon Open ATP Challenger – Singles

Max Purcell was the defending champion but lost to Bradley Mousley in the second qualifying round.
Thomas Fabbiano won the title after defeating Teymuraz Gabashvili 7–5, 6–1 in the final.

## Seeds

* Lu Yen-hsun (second round)
* Konstantin Kravchuk (semifinals)
* Vasek Pospisil (quarterfinals)
* Illya Marchenko (second round)
* Blaž Kavčič (semifinals)
* Ruben Bemelmans (second round)
* Lee Duck-hee (second round)
* Go Soeda (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 | Semifinals | Final | Final | Final |
| 5 | Blaž Kavčič | 4 | 3 | | | | |
| | Thomas Fabbiano | 6 | 6 | | | | |
| | Thomas Fabbiano | 6 | 6 | | Thomas Fabbiano | 7 | 6 |
| | | | | | Teymuraz Gabashvili | 5 | 1 |
| | Teymuraz Gabashvili | 1 | 6 | 6 | Teymuraz Gabashvili | 5 | 1 |
| 2 | Konstantin Kravchuk | 6 | 3 | 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 | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | Y-h Lu | 6 | 6 | | | | | | | | | | | | | | | |
| | P Gunneswaran | 2 | 2 | | 1 | Y-h Lu | 3 | 1 | | | | | | | | | | |
| | M Chiudinelli | 3 | 6 | 6 | | M Chiudinelli | 6 | 6 | | | | | | | | | | |
| WC | Kim Cheong-eui | 6 | 2 | 3 | | | | | | | M Chiudinelli | 3 | 4 | | | | | |
| | B Klein | 6 | 6 | | | | | | | 5 | B Kavčič | 6 | 6 | | | | | |
| WC | Y-s Chung | 3 | 4 | | | B Klein | 4 | 2 | | | | | | | | | | |
| SE | JP Paz | 3 | 3 | | 5 | B Kavčič | 6 | 6 | | | | | | | | | | |
| 5 | B Kavčič | 6 | 6 | | | | | | | | | | | | 5 | B Kavčič | 4 | 3 |
| 4 | I Marchenko | 5 | 7 | 6 | | | | | | | | | | | | T Fabbiano | 6 | 6 |
| | M Tepavac | 7 | 5 | 1 | 4 | I Marchenko | 6 | 5 | 4 | | | | | | | | | |
| Q | B Mousley | 5 | 4 | | | A Santillan | 1 | 7 | 6 | | | | | | | | | |
| | A Santillan | 7 | 6 | | | | | | | | A Santillan | 2 | 7 | 4 | | | | |
| | T Fabbiano | 6 | 6 | | | | | | | | T Fabbiano | 6 | 5 | 6 | | | | |
| WC | J-m Lee | 0 | 1 | | | T Fabbiano | 6 | 6 | | | | | | | | | | |
| | T Ito | 6 | 3 | 4 | 7 | D-h Lee | 3 | 2 | | | | | | | | | | |
| 7 | D-h Lee | 4 | 6 | 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 | Semifinals |
| 8 | G Soeda | 7$^7$ | 6 | | | | | | | | | | | | | | | | |
| Q | A Krajicek | 6$^3$ | 2 | | 8 | G Soeda | 4 | 3 | | | | | | | | | | | |
| | T Gabashvili | 6 | 6 | | | T Gabashvili | 6 | 6 | | | | | | | | | | | |
| | O Jasika | 2 | 2 | | | | | | | | T Gabashvili | 6 | 7$^7$ | | | | | | |
| Q | H Hurkacz | 6 | 6 | | | | | | | 3 | V Pospisil | 4 | 6$^5$ | | | | | | |
| | S-w Kwon | 4 | 3 | | Q | H Hurkacz | 6$^5$ | 7 | 1 | | | | | | | | | | |
| | J Jung | 5 | 0 | | 3 | V Pospisil | 7$^7$ | 5 | 6 | | | | | | | | | | |
| 3 | V Pospisil | 7 | 6 | | | | | | | | | | | | | T Gabashvili | 1 | 6 | 6 |
| 6 | R Bemelmans | 6 | 7$^7$ | | | | | | | | | | | | 2 | K Kravchuk | 6 | 3 | 4 |
| | M Matosevic | 1 | 6$^2$ | | 6 | R Bemelmans | 1 | 6$^2$ | | | | | | | | | | | |
| Q | L Broady | 7 | 6 | | Q | L Broady | 6 | 7$^7$ | | | | | | | | | | | |
| | H Moriya | 5 | 2 | | | | | | | Q | L Broady | 7$^7$ | 5 | 4 | | | | | |
| WC | S-c Hong | 3 | 6 | 4 | | | | | | 2 | K Kravchuk | 6$^5$ | 7 | 6 | | | | | |
| PR | Y Bhambri | 6 | 3 | 6 | PR | Y Bhambri | 2 | 6 | 3 | | | | | | | | | | |
| | S Doumbia | 4 | 2 | | 2 | K Kravchuk | 6 | 1 | 6 | | | | | | | | | | |
| 2 | K Kravchuk | 6 | 6 | | | | | | | | | | | | | | | | |