| Singles | |
|---|---|
| 2018 International Challenger Zhangjiagang | |
| Champion |  Yasutaka Uchiyama |
| Runner-up |  Jason Jung |
| Final score | 6–2, 6–2 |
Jason Jung was the defending champion but lost in the final to Yasutaka Uchiyama.
Uchiyama won the title after defeating Jung 6–2, 6–2 in the final.
Jason Jung (final) Tatsuma Ito (second round)
Zhang Ze (first round) Go Soeda (second round)
Filip Peliwo (first round)
Miomir Kecmanović (semifinals) Hiroki Moriya (second round)
Alexander Bublik (semifinals)| Semifinals | Final | ||||||||||||
| 1 | Jason Jung | 77 | 65 | 6 | |||||||||
| 8 | Alexander Bublik | 63 | 77 | 0 | |||||||||
| 1 | Jason Jung | 2 | 2 | ||||||||||
| Yasutaka Uchiyama | 6 | 6 | |||||||||||
| Yasutaka Uchiyama | 6 | 4 | 7 | ||||||||||
| 6 | Miomir Kecmanović | 3 | 6 | 5 | |||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | J Jung | 6 | 6 | ||||||||||||||||||||||||
| Q | Y Shimizu | 4 | 3 | 1 | J Jung | 6 | 6 | ||||||||||||||||||||
| Z Li | 0 | 6 | 3 | WC | Zh Zhang | 4 | 4 | ||||||||||||||||||||
| WC | Zh Zhang | 6 | 1 | 6 | 1 | J Jung | 7 | 6 | |||||||||||||||||||
| T-h Yang | 4 | 1r |  A Santillan | 5 | 2 | ||||||||||||||||||||||
| A Santillan | 6 | 3 | A Santillan | 7 | 64 | 6 | |||||||||||||||||||||
| WC | R Te | 6 | 6 | WC | R Te | 5 | 77 | 4 | |||||||||||||||||||
| 5 | F Peliwo | 4 | 4 | 1 | J Jung | 77 | 65 | 6 | |||||||||||||||||||
| 4 | G Soeda | 7 | 7 | 8 | A Bublik | 63 | 77 | 0 | |||||||||||||||||||
 A Bega | 5 | 5 | 4 | G Soeda | 5 | 6 | 2 | ||||||||||||||||||||
 Y-s Chung | 3 | 6 | 6 | Y-s Chung | 7 | 3 | 6 | ||||||||||||||||||||
 R Safiullin | 6 | 4 | 3 | Y-s Chung | 4 | 4 | |||||||||||||||||||||
| Q | D Kelly | 77 | 7 | 8 | A Bublik | 6 | 6 | ||||||||||||||||||||
| S-w Kwon | 65 | 5 | Q | D Kelly | 5 | 4 | |||||||||||||||||||||
| LL | Y Takahashi | 3 | 4 | 8 | A Bublik | 7 | 6 | ||||||||||||||||||||
| 8 | A Bublik | 6 | 6 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 7 | H Moriya | 78 | 6 | ||||||||||||||||||||||||
| Q |  T Lamasine | 66 | 2 | 7 | H Moriya | 6 | 65 | 3 | |||||||||||||||||||
| Y Uchiyama | 6 | 4 | Y Uchiyama | 4 | 77 | 6 | |||||||||||||||||||||
 B Kavčič | 3 | 2r | Y Uchiyama | 6 | 6 | ||||||||||||||||||||||
 U Ignatik | 6 | 77 | U Ignatik | 4 | 3 | ||||||||||||||||||||||
 A Šetkić | 2 | 63 | U Ignatik | 78 | 6 | ||||||||||||||||||||||
| D-h Lee | 6 | 5 | 6 | D-h Lee | 66 | 1 | |||||||||||||||||||||
| 3 | Ze Zhang | 3 | 7 | 0 | Y Uchiyama | 6 | 4 | 7 | |||||||||||||||||||
| 6 | M Kecmanović | 6 | 3 | 6 | 6 | M Kecmanović | 3 | 6 | 5 | ||||||||||||||||||
| M Purcell | 3 | 6 | 3 | 6 | M Kecmanović | 2 | 6 | 6 | |||||||||||||||||||
| Q |  F Ferreira Silva | 4 | 4 |  J Rodionov | 6 | 3 | 3 | ||||||||||||||||||||
| J Rodionov | 6 | 6 | 6 | M Kecmanović | 6 | 6 | |||||||||||||||||||||
| WC | Y Wu | 6 | 6 | WC | Y Wu | 4 | 4 | ||||||||||||||||||||
| WC | Y He | 3 | 4 | WC | Y Wu | 78 | 4 | 6 | |||||||||||||||||||
| S Diez | 4 | 1 | 2 | T Ito | 66 | 6 | 3 | ||||||||||||||||||||
| 2 | T Ito | 6 | 6 | ||||||||||||||||||||||||
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