# 2019 Seoul Open Challenger – Singles

Mackenzie McDonald was the defending champion but chose not to defend his title.
Kwon Soon-woo won the title after defeating Max Purcell 7–5, 7–5 in the final.

## Seeds

All seeds receive a bye into the second round.
* Jordan Thompson (withdrew)
* Ričardas Berankis (third round)
* Sergiy Stakhovsky (third round)
* Brayden Schnur (second round)
* Lukáš Lacko (third round)
* Jason Jung (second round)
* Marcos Baghdatis (second round)
* Evgeny Donskoy (third round)
* Alex Bolt (quarterfinals)
* Ramkumar Ramanathan (third round)
* Kwon Soon-woo (champion)
* Tatsuma Ito (quarterfinals)
* Nikola Milojević (semifinals)
* Ruben Bemelmans (second round)
* Hiroki Moriya (second round)
* Yūichi Sugita (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

| Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| | Yasutaka Uchiyama | 4 | 7$^8$ | 5 | | | | | | | | |
| 11 | Kwon Soon-woo | 6 | 6$^6$ | 7 | | | | | | | | |
| 11 | Kwon Soon-woo | 6 | 6$^6$ | 7 | 11 | Kwon Soon-woo | 7$^7$ | 6 | | | | |
| | | | | | | Wu Tung-lin | 6$^4$ | 3 | | | | |
| | Wu Tung-lin | 7 | 6 | | | Wu Tung-lin | 6$^4$ | 3 | | | | |
| 9 | Alex Bolt | 5 | 4 | | | | | | | | | |
| 9 | Alex Bolt | 5 | 4 | | | | | | 11 | Kwon Soon-woo | 7 | 7 |
| | | | | | | | | | | Max Purcell | 5 | 5 |
| | Li Zhe | 4 | 5 | | | | | | | | | | Max Purcell | 5 | 5 |
| 13 | Nikola Milojević | 6 | 7 | | | | | | | | | |
| 13 | Nikola Milojević | 6 | 7 | | 13 | Nikola Milojević | 2 | 0 | | | | |
| | | | | | | Max Purcell | 6 | 6 | | | | |
| 12 | Tatsuma Ito | 7$^8$ | 6$^2$ | 3 | | Max Purcell | 6 | 6 | | | | |
| | Max Purcell | 6$^6$ | 7$^7$ | 6 | | | | | | | | |

### Top half
#### Section 1

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | Alt | S Balaji | 7$^7$ | 3 | 4 | | | | | | | | | |
| | C İlkel | 3 | 6 | 3 | | Y Uchiyama | 6$^5$ | 6 | 6 | | | | | | | | | |
| | Y Uchiyama | 6 | 1 | 6 | | | | | | | Y Uchiyama | 6 | 6 | | | | | |
| | S Robert | 6 | 2 | 4 | | | | | | | Y-s Chung | 4 | 4 | | | | | |
| | Y-s Chung | 1 | 6 | 6 | | Y-s Chung | 6 | 6 | | | | | | | | | | |
| | | | | | 16 | Y Sugita | 2 | 3 | | | | | | | | | | |
| | | | | | | | | | | | | | | | Y Uchiyama | 4 | 7$^8$ | 5 |
| | | | | | | | | | | | | | | 11 | S-w Kwon | 6 | 6$^6$ | 7 |
| | | | | | 11 | S-w Kwon | 6 | 6 | | | | | | | | | | |
| ITF | Shintaro Imai | 6 | 6 | | ITF | S Imai | 3 | 2 | | | | | | | | | | |
| WC | Ho Chung | 1 | 3 | | | | | | | 11 | S-w Kwon | 7$^7$ | 6 | | | | | |
| ITF | Y Bai | 6 | 6 | | | | | | | 8 | E Donskoy | 6$^2$ | 3 | | | | | |
| Q | Jacob Grills | 4 | 1 | | ITF | Y Bai | 6 | 3 | 3 | | | | | | | | | |
| | | | | | 8 | E Donskoy | 4 | 6 | 6 | | | | | | | | | |

#### Section 2

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 4 | B Schnur | 1 | 7$^8$ | 2 | | | | | | | | |
| | K Uchida | 6 | 1 | 4 | | T-l Wu | 6 | 6$^6$ | 6 | | | | | | | | |
| | T-l Wu | 4 | 6 | 6 | | | | | | | T-l Wu | 6 | 7 | | | | |
| LL | Xia Zihao | 4 | 1 | | | | | | | | S Myneni | 4 | 5 | | | | |
| | S Myneni | 6 | 6 | | | S Myneni | 6 | 6 | | | | | | | | | |
| | | | | | 15 | H Moriya | 2 | 1 | | | | | | | | | |
| | | | | | | | | | | | | | | | T-l Wu | 7 | 6 |
| | | | | | | | | | | | | | | 9 | A Bolt | 5 | 4 |
| | | | | | 9 | A Bolt | 7$^7$ | 6$^3$ | 6 | | | | | | | | |
| | G Soeda | 6 | 4 | 4 | | T-h Yang | 6$^5$ | 7$^7$ | 3 | | | | | | | | |
| | T-h Yang | 2 | 6 | 6 | | | | | | 9 | A Bolt | 7$^7$ | 6 | | | | |
| | A Santillan | d | | | | | | | | | A Santillan | 6$^4$ | 3 | | | | |
| ITF | Y Hossam | | | | | A Santillan | 6 | 5 | 7$^7$ | | | | | | | | |
| | | | | | 6 | J Jung | 3 | 7 | 6$^3$ | | | | | | | | |

### Bottom half
#### Section 3

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 7 | M Baghdatis | 4 | 2 | | | | | | | | | | |
| ITF | M Echargui | 2 | 4 | | | Z Li | 6 | 6 | | | | | | | | | | |
| | Z Li | 6 | 6 | | | | | | | | Z Li | 6 | 6$^5$ | 7$^8$ | | | | |
| Q | J-s Nam | 7 | 6 | | | | | | | 10 | R Ramanathan | 4 | 7$^7$ | 6$^6$ | | | | |
| | D-h Lee | 5 | 1 | | Q | J-s Nam | 3 | 6$^6$ | | | | | | | | | | |
| | | | | | 10 | R Ramanathan | 6 | 7$^8$ | | | | | | | | | | |
| | | | | | | | | | | | | | | | | Z Li | 4 | 5 |
| | | | | | | | | | | | | | | | 13 | N Milojević | 6 | 7 |
| | | | | | 13 | N Milojević | 6$^1$ | 6 | 6 | | | | | | | | | |
| WC | Kim Dong-ju | 2 | 2 | | WC | J-m Lee | 7$^7$ | 3 | 3 | | | | | | | | | |
| WC | J-m Lee | 6 | 6 | | | | | | | 13 | N Milojević | 6 | 7$^7$ | | | | | |
| ITF | R Noguchi | 3 | 6 | 6 | | | | | | 3 | S Stakhovsky | 2 | 6$^5$ | | | | | |
| WC | S-c Hong | 6 | 4 | 0 | ITF | R Noguchi | 1 | 4 | | | | | | | | | | |
| | | | | | 3 | S Stakhovsky | 6 | 6 | | | | | | | | | | |

#### Section 4

| First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | 5 | L Lacko | 6 | 6 | | | | | | | | | | | |
| | S Mukund | 2 | 4 | | L Saville | 3 | 4 | | | | | | | | | | | |
| | L Saville | 6 | 6 | | | | | | 5 | L Lacko | 4 | 1 | | | | | | |
| WC | Shin San-hui | 2 | 0 | | | | | | 12 | T Ito | 6 | 6 | | | | | | |
| | F Peliwo | 6 | 6 | | F Peliwo | 5 | 2 | | | | | | | | | | | |
| | | | | 12 | T Ito | 7 | 6 | | | | | | | | | | | |
| | | | | | | | | | | | | | | 12 | T Ito | 7$^8$ | 6$^2$ | 3 |
| | | | | | | | | | | | | | | | M Purcell | 6$^6$ | 7$^7$ | 6 |
| | | | | 14 | R Bemelmans | 2 | 6$^4$ | | | | | | | | | | | |
| | M Banes | 6$^4$ | 3 | | M Purcell | 6 | 7$^7$ | | | | | | | | | | | |
| | M Purcell | 7$^7$ | 6 | | | | | | | M Purcell | 4 | 6 | 6 | | | | | |
| | A Šetkić | 7 | 7$^7$ | | | | | | 2 | R Berankis | 6 | 4 | 3 | | | | | |
| | G Oliveira | 5 | 6$^4$ | | A Šetkić | 4 | 6 | 4 | | | | | | | | | | |
| | | | | 2 | R Berankis | 6 | 3 | 6 | | | | | | | | | | |