| Doubles | |
|---|---|
| 2019 International Challenger Zhangjiagang | |
| Champions |  Max Purcell Luke Saville |
| Runners-up |  Sriram Balaji  Hans Hach Verdugo |
| Score | 6–2, 7–6(7–5) |
Gong Maoxin and Zhang Ze were the defending champions but lost in the quarterfinals to Ruben Gonzales and Alex Lawson. [1]
Max Purcell and Luke Saville won the title after defeating Sriram Balaji and Hans Hach Verdugo 6–2, 7–6(7–5) in the final.
Hsieh Cheng-peng / 
Christopher Rungkat (semifinals)
Gong Maoxin / Zhang Ze (quarterfinals) Max Purcell / Luke Saville (champions) Sriram Balaji / Hans Hach Verdugo (final)| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | C-p Hsieh C Rungkat | 2 | 77 | [11] | |||||||||||||||||||||||
| WC | X Gao F Sun | 6 | 65 | [9] | 1 | C-p Hsieh C Rungkat | 4 | 6 | [10] | ||||||||||||||||||
| ITF |  F Alcantara  B Saraiva | 2 | 6 | [5] |  L Margaroli V Vardhan | 6 | 1 | [6] | |||||||||||||||||||
| L Margaroli V Vardhan | 6 | 4 | [10] | 1 | C-p Hsieh C Rungkat | 4 | 3 | ||||||||||||||||||||
| 4 | S Balaji H Hach Verdugo | 7 | 63 | [10] | 4 | S Balaji H Hach Verdugo | 6 | 6 | |||||||||||||||||||
 H Heliövaara  H Podlipnik Castillo | 5 | 77 | [8] | 4 | S Balaji H Hach Verdugo | 3 | 77 | [10] | |||||||||||||||||||
| WC | R Hua Zh Zhang | 4 | 6 | [10] | WC | R Hua Zh Zhang | 6 | 64 | [5] | ||||||||||||||||||
| WC | Xia Zihao Zeng Shihong | 6 | 2 | [4] | 4 | S Balaji H Hach Verdugo | 2 | 65 | |||||||||||||||||||
| ITF |  JP Fruttero  I Gakhov | 6 | 6 | 3 | M Purcell L Saville | 6 | 77 | ||||||||||||||||||||
| Alt |  Y-s Chung S-w Kwon | 4 | 4 | ITF | JP Fruttero I Gakhov | 2 | 1 | ||||||||||||||||||||
 H Moriya T-h Yang | 4 | 6 | [4] | 3 | M Purcell L Saville | 6 | 6 | ||||||||||||||||||||
| 3 | M Purcell L Saville | 6 | 3 | [10] | 3 | M Purcell L Saville | 6 | 6 | |||||||||||||||||||
| R Gonzales A Lawson | w/o | R Gonzales A Lawson | 3 | 3 | |||||||||||||||||||||||
 J Hernández-Fernández  B Schnur | R Gonzales A Lawson | 77 | 7 | ||||||||||||||||||||||||
T Matsui  So Ratiwatana | 4 | 0 | 2 | M Gong Ze Zhang | 65 | 5 | |||||||||||||||||||||
| 2 | M Gong Ze Zhang | 6 | 6 | ||||||||||||||||||||||||
Gong Maoxin and Yi Chu-huan were the defending champions but chose to defend their title with different partners. Gong partnered Zhang Ze but lost in the quarterfinals to Ruben Gonzales and Hsieh Cheng-peng. Yi partnered Yuya Kibi but withdrew from the tournament due to a Kibi injury.
Tristan Lamasine and Franko Škugor were the defending champions but chose not to defend their title.
Matt Reid and John-Patrick Smith were the defending champions but chose not to defend their title.
Mikhail Elgin and Alexander Kudryavtsev were the defending champions but chose not to defend their title.
Wu Di and Zhang Zhizhen were the defending champions but only Wu chose to defend his title, partnering Wu Yibing. Wu lost in the quarterfinals to Quentin Halys and Calvin Hemery.
Dino Marcan and Tristan-Samuel Weissborn were the defending champions but chose not to defend their title.
Gao Xin and Zhang Zhizhen were the defending champions but lost in the quarterfinals to Gong Maoxin and Zhang Ze.
Radu Albot and Rubin Statham were the defending champions but only Statham chose to defend his title, partnering Hiroki Moriya. Statham lost in the first round to Sriram Balaji and Saketh Myneni.
Sriram Balaji and Vishnu Vardhan were the defending champions but only Balaji chose to defend his title, partnering Jeevan Nedunchezhiyan. Balaji lost in the final to Hsieh Cheng-peng and Christopher Rungkat.
Mackenzie McDonald and Tommy Paul were the defending champions but chose not to defend their title.
James Cerretani and Joe Salisbury were the defending champions but chose not to defend their title.
Denys Molchanov and Igor Zelenay were the defending champions but chose not to defend their title.
Hsieh Cheng-peng and Rameez Junaid were the defending champions but only Hsieh chose to defend his title, partnering Christopher Rungkat. Hsieh successfully defended his title.
The 2019 International Challenger Zhangjiagang was a professional tennis tournament played on hard courts. It was the third edition of the tournament which was part of the 2019 ATP Challenger Tour. It took place in Zhangjiagang, China between 18 and 24 March 2019.
Aliaksandr Bury and Lloyd Harris were the defending champions but chose not to defend their title.
Gong Maoxin and Zhang Ze were the defending champions but chose not to defend their title.
Hsieh Cheng-peng and Yang Tsung-hua were the defending champions but chose not to defend their title.
Gong Maoxin and Zhang Ze were the defending champions but chose not to defend their title.
André Göransson and Sem Verbeek were the defending champions but chose not to defend their title.
Nathaniel Lammons and Jackson Withrow were the defending champions but chose not to defend their title.