| Doubles | |
|---|---|
| 2019 Santaizi ATP Challenger | |
| Champions |  Sriram Balaji  Jonathan Erlich |
| Runners-up |  Sander Arends  Tristan-Samuel Weissborn |
| Score | 6–3, 6–2 |
Matthew Ebden and Andrew Whittington were the defending champions but chose not to defend their title. [1]
Sriram Balaji and Jonathan Erlich won the title after defeating Sander Arends and Tristan-Samuel Weissborn 6–3, 6–2 in the final.
Hsieh Cheng-peng / 
Christopher Rungkat (semifinals)
Max Purcell / Luke Saville (first round) Sriram Balaji / Jonathan Erlich (champions) Sander Arends / Tristan-Samuel Weissborn (final)| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | C-p Hsieh C Rungkat | 64 | 6 | [11] | |||||||||||||||||||||||
 R Gonzales  So Ratiwatana | 77 | 1 | [9] | 1 | C-p Hsieh C Rungkat | 6 | 710 | ||||||||||||||||||||
| WC | Y-h Hsu T-l Wu | 7 | 65 | [8] | WC | J Jung J Wang | 4 | 68 | |||||||||||||||||||
| WC | J Jung J Wang | 5 | 77 | [10] | 1 | C-p Hsieh C Rungkat | 2 | 3 | |||||||||||||||||||
| 3 | S Balaji J Erlich | 6 | 3 | [11] | 3 | S Balaji J Erlich | 6 | 6 | |||||||||||||||||||
 L Margaroli V Vardhan | 4 | 6 | [9] | 3 | S Balaji J Erlich | 6 | 6 | ||||||||||||||||||||
 S-w Kwon T-h Yang | 65 | 3 | S Myneni R Ramanathan | 4 | 3 | ||||||||||||||||||||||
| S Myneni R Ramanathan | 77 | 6 | 3 | S Balaji J Erlich | 6 | 6 | |||||||||||||||||||||
 M Janvier S Robert | 6 | 64 | [10] | 4 | S Arends T-S Weissborn | 3 | 2 | ||||||||||||||||||||
D Pel  H Podlipnik Castillo | 1 | 77 | [6] | M Janvier S Robert | 64 | 6 | [8] | ||||||||||||||||||||
D Novak  S Stakhovsky | 6 | 4 | [4] | 4 | S Arends T-S Weissborn | 77 | 4 | [10] | |||||||||||||||||||
| 4 | S Arends T-S Weissborn | 3 | 6 | [10] | 4 | S Arends T-S Weissborn | 2 | 6 | [11] | ||||||||||||||||||
| WC | T Chen R Ho | 3 | 77 | [3] |  G Oliveira  Y Uchiyama | 6 | 3 | [9] | |||||||||||||||||||
| G Oliveira Y Uchiyama | 6 | 63 | [10] | G Oliveira Y Uchiyama | 6 | 6 | |||||||||||||||||||||
| T Matsui H Moriya | 6 | 3 | [10] | T Matsui H Moriya | 4 | 4 | |||||||||||||||||||||
| 2 | M Purcell L Saville | 4 | 6 | [7] | |||||||||||||||||||||||
Andrej Martin and Hans Podlipnik were the defending champions but chose to participate with different partners. Martin chose to participate with Tomasz Bednarek, while Podlipnik chose to partner with Lukáš Dlouhý. Martin and Podlipnik faced each other in the semifinals, with Podlipnik advancing to the final. Podlipnik failed to defend his title, losing to Sander Arends and Tristan-Samuel Weissborn 7–6(10–8), 6–7(4–7), [10–5] in the final.
Sander Arends and Tristan-Samuel Weissborn were the defending champions but only Weissborn chose to defend his title, partnering Dino Marcan. Weissborn lost in the quarterfinals to Hugo Nys and Max Schnur.
Mikhail Elgin and Alexander Kudryavtsev were the defending champions but chose not to defend their title.
Hans Podlipnik-Castillo and Andrei Vasilevski were the defending champions but chose not to defend their title.
Evgeny Donskoy and Mikhail Elgin were the defending champions but chose not to defend their title.
Andre Begemann and Frederik Nielsen were the defending champions but chose not to defend their title.
Romain Arneodo and Tristan-Samuel Weissborn were the defending champions but only Weissborn chose to defend his title, partnering Sander Arends. Weissborn lost in the first round to Jürgen Melzer and Filip Polášek.
Sander Gillé and Joran Vliegen were the defending champions but chose not to defend their title.
Sander Arends and Tristan-Samuel Weissborn were the defending champions but lost in the semifinals to Jonathan Eysseric and Antonio Šančić.
The 2019 Santaizi ATP Challenger was a professional tennis tournament played on indoor hard courts. It was the sixth edition of the tournament which was part of the 2019 ATP Challenger Tour. It took place in Taipei, Taiwan between 8 and 14 April.
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.
Toshihide Matsui and Frederik Nielsen were the defending champions but only Matsui chose to defend his title, partnering Ričardas Berankis. Matsui lost in the first round to Nam Ji-sung and Song Min-kyu.
Hsieh Cheng-peng and Christopher Rungkat were the defending champions and successfully defended their title, defeating Toshihide Matsui and Vishnu Vardhan 7–6(9–7), 6–1 in the final.
Sander Gillé and Joran Vliegen were the defending champions but chose not to defend their title.
Sander Arends and Tristan-Samuel Weissborn were the defending champions but only Weissborn chose to defend his title, partnering Antonio Šančić. Weissborn successfully defended his title after defeating Teymuraz Gabashvili and Lukáš Lacko 7–5, 6–7(5–7), [10–7] in the final.
Philipp Oswald and Filip Polášek were the defending champions but chose not to defend their title.
Simone Bolelli and David Vega Hernández were the defending champions but chose not to defend their title.
Denys Molchanov and Aleksandr Nedovyesov were the defending champions but chose not to defend their title.
Sander Arends and David Pel were the defending champions but only Pel chose to defend his title, partnering Gijs Brouwer. Pel lost in the first round to Jérôme Kym and Joel Schwärzler.