| Singles | |
|---|---|
| 2017 Seoul Open Challenger | |
| Champion |  Thomas Fabbiano |
| Runner-up |  Kwon Soon-woo |
| Final score | 1–6, 6–4, 6–3 |
Sergiy Stakhovsky was the defending champion but chose not to defend his title.
Thomas Fabbiano won the title after defeating Kwon Soon-woo 1–6, 6–4, 6–3 in the final.
Lu Yen-hsun (first round) Chung Hyeon (withdrew)
Dudi Sela (quarterfinals, retired)
Konstantin Kravchuk (first round)
Vasek Pospisil (second round)
Blaž Kavčič (first round)
Illya Marchenko (first round)
Ruben Bemelmans (semifinals)| Semifinals | Final | ||||||||||||
| 8 | Ruben Bemelmans | 4 | 1 | ||||||||||
| Thomas Fabbiano | 6 | 6 | |||||||||||
| Thomas Fabbiano | 1 | 6 | 6 | ||||||||||
| Kwon Soon-woo | 6 | 4 | 3 | ||||||||||
| Lee Duck-hee | 3 | 0 | |||||||||||
| Kwon Soon-woo | 6 | 6 | |||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | Y-h Lu | 3 | 4 | ||||||||||||||||||||||||
| WC | Y-s Chung | 6 | 6 | WC | Y-s Chung | 6 | 64 | 3 | |||||||||||||||||||
| SE |  L Broady | 3 | 4 |  H Moriya | 4 | 77 | 6 | ||||||||||||||||||||
| H Moriya | 6 | 6 | H Moriya | 3 | 1 | ||||||||||||||||||||||
| A Santillan | 7 | 4 | 3 | 8 | R Bemelmans | 6 | 6 | ||||||||||||||||||||
| LL |  L Saville | 5 | 6 | 6 | LL | L Saville | 4 | 6 | 5 | ||||||||||||||||||
| B Klein | 4 | 6 | 1 | 8 | R Bemelmans | 6 | 3 | 7 | |||||||||||||||||||
| 8 | R Bemelmans | 6 | 3 | 6 | 8 | R Bemelmans | 4 | 1 | |||||||||||||||||||
| 4 | K Kravchuk | 4 | 3 | T Fabbiano | 6 | 6 | |||||||||||||||||||||
| G Soeda | 6 | 6 | G Soeda | 6 | 6 | ||||||||||||||||||||||
| PR | A Ward | 3 | 4 | WC | Y-s Kim | 2 | 4 | ||||||||||||||||||||
| WC | Kim Young-seok | 6 | 6 | G Soeda | 6 | 2 | 3 | ||||||||||||||||||||
| O Jasika | 4 | 78 | 61 | T Fabbiano | 3 | 6 | 6 | ||||||||||||||||||||
 M Chiudinelli | 6 | 66 | 77 | M Chiudinelli | 1 | 2 | |||||||||||||||||||||
| T Fabbiano | 6 | 6 | T Fabbiano | 6 | 6 | ||||||||||||||||||||||
| 7 | I Marchenko | 2 | 4 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 5 | V Pospisil | 6 | 6 | ||||||||||||||||||||||||
 S Doumbia | 3 | 2 | 5 | V Pospisil | 6 | 63 | 66 | ||||||||||||||||||||
| D-h Lee | 6 | 6 | D-h Lee | 2 | 77 | 78 | |||||||||||||||||||||
| Q | Shuichi Sekiguchi | 0 | 3 | D-h Lee | 5 | 79 | 3 | ||||||||||||||||||||
 S Bangoura | 2 | 1 | 3 | D Sela | 7 | 67 | 0r | ||||||||||||||||||||
| Q | F Auger-Aliassime | 6 | 6 | Q | F Auger-Aliassime | 3 | 1 | ||||||||||||||||||||
| WC | Ho Chung | 5 | 3 | 3 | D Sela | 6 | 6 | ||||||||||||||||||||
| 3 | D Sela | 7 | 6 | D-h Lee | 3 | 0 | |||||||||||||||||||||
| 6 | B Kavčič | 64 | 3 | S-w Kwon | 6 | 6 | |||||||||||||||||||||
| S-w Kwon | 77 | 6 | S-w Kwon | 77 | 6 | ||||||||||||||||||||||
| T Ito | 2 | 3 | Alt |  M Tepavac | 61 | 1 | |||||||||||||||||||||
| Alt | M Tepavac | 6 | 6 | S-w Kwon | 67 | 6 | 6 | ||||||||||||||||||||
| Q | A Krajicek | 716 | 6 | A Sarkissian | 79 | 4 | 3 | ||||||||||||||||||||
| WC | S-c Hong | 614 | 3 | Q | A Krajicek | 1 | 2 | ||||||||||||||||||||
| A Sarkissian | 6 | 6 | A Sarkissian | 6 | 6 | ||||||||||||||||||||||
| Q | D Nguyen | 3 | 4 | ||||||||||||||||||||||||
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