# 2019 International Challenger Zhangjiagang – Singles

Yasutaka Uchiyama was the defending champion but chose not to defend his title.
Marc Polmans won the title after defeating Lorenzo Giustino 6–4, 4–6, 7–6$^{(7–4)}$ in the final.

## Seeds

All seeds receive a bye into the second round.
* Brayden Schnur (second round)
* James Duckworth (third round)
* Kwon Soon-woo (quarterfinals)
* Hiroki Moriya (third round)
* Yūichi Sugita (second round)
* Lorenzo Giustino (final)
* Blaž Rola (third round)
* Zhang Ze (quarterfinals)
* Go Soeda (second round)
* Marc Polmans (champion)
* Viktor Galović (semifinals, withdrew)
* Mohamed Safwat (second round)
* Stefano Napolitano (quarterfinals)
* Filip Peliwo (third round)
* Mathias Bourgue (semifinals)
* Lee Duck-hee (withdrew)
* Uladzimir Ignatik (quarterfinals)

## 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 | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final | Final |
| 17 | Uladzimir Ignatik | 4 | 2 | | | | | | | | | | |
| 11 | Viktor Galović | 6 | 6 | | | | | | | | | | |
| 11 | Viktor Galović | 6 | 6 | 11 | Viktor Galović | | | | | | | | |
| | | | | 6 | Lorenzo Giustino | w/o | | | | | | | |
| 3 | Kwon Soon-woo | 3 | 2 | 6 | Lorenzo Giustino | w/o | | | | | | | |
| 6 | Lorenzo Giustino | 6 | 6 | | | | | | | | | | |
| 6 | Lorenzo Giustino | 6 | 6 | | | | | | 6 | Lorenzo Giustino | 4 | 6 | 6$^4$ |
| | | | | | | | | | 10 | Marc Polmans | 6 | 4 | 7$^7$ |
| 8 | Zhang Ze | 4 | 2 | | | | | | | | | | | 10 | Marc Polmans | 6 | 4 | 7$^7$ |
| 15 | Mathias Bourgue | 6 | 6 | | | | | | | | | | |
| 15 | Mathias Bourgue | 6 | 6 | 15 | Mathias Bourgue | 2 | 6 | 3 | | | | | |
| | | | | 10 | Marc Polmans | 6 | 4 | 6 | | | | | |
| 10 | Marc Polmans | 6 | 7 | 10 | Marc Polmans | 6 | 4 | 6 | | | | | |
| 13 | Stefano Napolitano | 3 | 5 | | | | | | | | | | |

### 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 |
| | | | | | 1 | B Schnur | 4 | 7$^7$ | 6$^6$ | | | | | | | | |
| | A Harris | 6 | 6 | | | A Harris | 6 | 6$^2$ | 7$^8$ | | | | | | | | |
| WC | Y He | 1 | 1 | | | | | | | | A Harris | 2 | 5 | | | | |
| | Y Wu | 2 | 6 | 2 | | | | | | 17 | U Ignatik | 6 | 7 | | | | |
| | G Oliveira | 6 | 2 | 6 | | G Oliveira | 3 | 2 | | | | | | | | | |
| | | | | | 17 | U Ignatik | 6 | 6 | | | | | | | | | |
| | | | | | | | | | | | | | | 17 | U Ignatik | 4 | 2 |
| | | | | | | | | | | | | | | 11 | V Galović | 6 | 6 |
| | | | | | 11 | V Galović | 6 | 6 | | | | | | | | | |
| WC | X Gao | 5 | 4 | | | D Wu | 1 | 4 | | | | | | | | | |
| | D Wu | 7 | 6 | | | | | | | 11 | V Galović | 6 | 6 | | | | |
| | Y-s Chung | 6 | 6 | | | | | | | | Y-s Chung | 3 | 2 | | | | |
| Q | F Sun | 4 | 4 | | | Y-s Chung | 4 | 7 | 6 | | | | | | | | |
| | | | | | 5 | Y Sugita | 6 | 5 | 2 | | | | | | | | |

#### Section 2

| 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 |
| | | | | 3 | S-w Kwon | 7$^8$ | 6 | | | | | | | | | |
| | G Clezar | 7$^7$ | 6 | | G Clezar | 6$^6$ | 3 | | | | | | | | | |
| Q | H Heliövaara | 6$^1$ | 3 | | | | | | 3 | S-w Kwon | 6 | 6 | | | | |
| | E Karlovskiy | 6 | 7 | | | | | | 14 | F Peliwo | 4 | 2 | | | | |
| ITF | Kim Cheong-eui | 2 | 5 | | E Karlovskiy | 1 | 4 | | | | | | | | | |
| | | | | 14 | F Peliwo | 6 | 6 | | | | | | | | | |
| | | | | | | | | | | | | | 3 | S-w Kwon | 3 | 2 |
| | | | | | | | | | | | | | 6 | L Giustino | 6 | 6 |
| | | | | 9 | G Soeda | 6 | 6$^4$ | 1 | | | | | | | | |
| | A Santillan | 2 | 1$^r$ | | M Purcell | 4 | 7$^7$ | 6 | | | | | | | | |
| | M Purcell | 6 | 2 | | | | | | | M Purcell | 3 | 4 | | | | |
| | M Banes | 4 | 3 | | | | | | 6 | L Giustino | 6 | 6 | | | | |
| PR | D Nguyen | 6 | 6 | PR | D Nguyen | 0 | 3 | | | | | | | | | |
| | | | | 6 | L Giustino | 6 | 6 | | | | | | | | | |

### Bottom half
#### Section 3

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 8 | Ze Zhang | 6 | 7$^7$ | | | | | | | | | |
| | T-h Yang | 4 | 2 | | ITF | K-M Maamoun | 0 | 6$^3$ | | | | | | | | | |
| ITF | K-M Maamoun | 6 | 6 | | | | | | 8 | Ze Zhang | 6 | 2 | 6 | | | | |
| | L Saville | 7 | 3 | 6 | | | | | | L Saville | 4 | 6 | 4 | | | | |
| | Renta Tokuda | 5 | 6 | 3 | | L Saville | 6 | 6 | | | | | | | | | |
| | | | | | 12 | M Safwat | 4 | 2 | | | | | | | | | |
| | | | | | | | | | | | | | | 8 | Ze Zhang | 4 | 2 |
| | | | | | | | | | | | | | | 15 | M Bourgue | 6 | 6 |
| | | | | | 15 | M Bourgue | 7 | 6 | | | | | | | | | |
| ITF | Baptiste Crepatte | 2 | 1 | | | S Mukund | 5 | 4 | | | | | | | | | |
| | S Mukund | 6 | 6 | | | | | | 15 | M Bourgue | 7 | 4 | 6 | | | | |
| | N Serdarušić | 6$^1$ | 6 | 2 | | | | | 4 | H Moriya | 5 | 6 | 1 | | | | |
| | A Molčan | 7$^7$ | 4 | 6 | | A Molčan | 6$^5$ | 6$^3$ | | | | | | | | | |
| | | | | | 4 | H Moriya | 7$^7$ | 7$^7$ | | | | | | | | | |

#### Section 4

| 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 | B Rola | 6 | 6 | | | | | | | | | | |
| WC | R Hua | 4 | 3 | | WC | Zh Zhang | 2 | 4 | | | | | | | | | | |
| WC | Zh Zhang | 6 | 6 | | | | | | | 7 | B Rola | 3 | 6$^5$ | | | | | |
| | Z Li | 6 | 3 | 4 | | | | | | 10 | M Polmans | 6 | 7$^7$ | | | | | |
| | J Hernández-Fernández | 1 | 6 | 6 | | J Hernández-Fernández | 3 | 3 | | | | | | | | | | |
| | | | | | 10 | M Polmans | 6 | 6 | | | | | | | | | | |
| | | | | | | | | | | | | | | | 10 | M Polmans | 6 | 7 |
| | | | | | | | | | | | | | | | 13 | S Napolitano | 3 | 5 |
| | | | | | 13 | S Napolitano | 2 | 6 | 6 | | | | | | | | | |
| ITF | I Gakhov | 6 | 1 | 4 | Alt | M Ochi | 6 | 3 | 4 | | | | | | | | | |
| Alt | Makoto Ochi | 3 | 6 | 6 | | | | | | 13 | S Napolitano | 6 | 3 | 7 | | | | |
| WC | Xia Zihao | 1 | 7$^7$ | 6 | | | | | | 2 | J Duckworth | 4 | 6 | 5 | | | | |
| | TK Wang | 6 | 6$^1$ | 3 | WC | Z Xia | 0 | 3 | | | | | | | | | | |
| | | | | | 2 | J Duckworth | 6 | 6 | | | | | | | | | | |