| Men's doubles | |
|---|---|
| 2024 Keio Challenger | |
| 2023 Champions |  Filip Bergevi  Mick Veldheer |
Filip Bergevi and Mick Veldheer were the defending champions [1] but chose not to defend their title.
| Men's doubles | |
|---|---|
| 2024 Keio Challenger | |
| 2023 Champions | Filip Bergevi Mick Veldheer |
Filip Bergevi and Mick Veldheer were the defending champions [1] but chose not to defend their title.
Nam Ji-sung / 
Matthew Romios (semifinals)
Vasil Kirkov / 
Marcus Willis (quarterfinals)
Anirudh Chandrasekar / Niki Kaliyanda Poonacha (first round) Thomas Fancutt / 
Jakub Paul (first round)| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | J-s Nam MC Romios | 5 | 6 | [10] | |||||||||||||||||||||||
 A Merino  C Negritu | 7 | 4 | [4] | 1 | J-s Nam MC Romios | 77 | 3 | [10] | |||||||||||||||||||
| O Jasika D Sweeny | 2 | 1 |  R Ho  P Isaro | 62 | 6 | [5] | |||||||||||||||||||||
| R Ho P Isaro | 6 | 6 | 1 | J-s Nam MC Romios | 3 | 6 | [4] | ||||||||||||||||||||
| 3 | A Chandrasekar N Kaliyanda Poonacha | 6 | 65 | [6] | B Bayldon C Puttergill | 6 | 2 | [10] | |||||||||||||||||||
 T Matsui K Uesugi | 3 | 77 | [10] | T Matsui K Uesugi | 3 | 63 | |||||||||||||||||||||
| Blake Bayldon C Puttergill | 6 | 6 | B Bayldon C Puttergill | 6 | 77 | ||||||||||||||||||||||
| WC | Hibiki Arimoto Yusaku Sugaya | 1 | 0 | B Bayldon C Puttergill | |||||||||||||||||||||||
| Alt |  P Henning Kris van Wyk | 6 | 5 | [11] | |||||||||||||||||||||||
| WC | Naoya Honda Shogo Sanada | 3 | 7 | [13] | WC | N Honda S Sanada | w/o | ||||||||||||||||||||
| Y Shimizu L Tu | 6 | 6 | Y Shimizu L Tu | ||||||||||||||||||||||||
| 4 | T Fancutt J Paul | 4 | 4 | WC | N Honda S Sanada | ||||||||||||||||||||||
 B Hassan S Myneni | 6 | 6 | B Hassan S Myneni | ||||||||||||||||||||||||
| Ryuki Matsuda R Noguchi | 3 | 2 | B Hassan S Myneni | 78 | 64 | [11] | |||||||||||||||||||||
| S Watanabe T Yuzuki | 3 | 4 | 2 | V Kirkov M Willis | 66 | 77 | [9] | ||||||||||||||||||||
| 2 | V Kirkov M Willis | 6 | 6 | ||||||||||||||||||||||||
Sadio Doumbia and Fabien Reboul were the defending champions but lost in the semifinals to Filip Bergevi and Petros Tsitsipas.
Hsu Yu-hsiou and Oleksii Krutykh were the defending champions but chose not to defend their title.
Franco Agamenone and Manuel Guinard were the defending champions but only Agamenone chose to defend his title, partnering Salvatore Caruso. Agamenone lost in the first round to Jacopo Berrettini and Andrea Pellegrino.
Sriram Balaji and Jeevan Nedunchezhiyan were the defending champions but chose not to defend their title.
Victor Vlad Cornea and Andrew Paulson were the defending champions but only Paulson chose to defend his title, partnering Petr Nouza. Paulson successfully defended his title after defeating Filip Bergevi and Mick Veldheer 7–5, 6–3 in the final.
Alexander Erler and Lucas Miedler were the defending champions but chose not to defend their title.
Denis Istomin and Evgeny Karlovskiy were the defending champions but withdrew from their quarterfinals match against Daniel Cukierman and Joshua Paris.
Victor Vlad Cornea and Ruben Gonzales were the defending champions but only Gonzales chose to defend his title, partnering Chung Yun-seong. Gonzales lost in the semifinals to Ray Ho and Calum Puttergill.
This was the first edition of the tournament.
Harri Heliövaara and Roman Jebavý were the defending champions but chose not to defend their title.
Sadio Doumbia and Fabien Reboul were the defending champions but chose not to defend their title.
Luke Johnson and Sem Verbeek were the defending champions but only Verbeek chose to defend his title, partnering André Göransson. He lost in the quarterfinals to Manuel Guinard and Grégoire Jacq.
Manuel Guinard and Grégoire Jacq were the defending champions and successfully defended their title after defeating Markos Kalovelonis and Vladyslav Orlov 4–6, 6–3, [10–6] in the final.
William Blumberg and Luis David Martínez were the defending champions but only Martínez chose to defend his title, partnering Oriol Roca Batalla. They lost in the first round to Andre Begemann and Patrik Niklas-Salminen.
Federico Gaio and Andrea Pellegrino were the defending champions but chose not to defend their title.
Fernando Romboli and Marcelo Zormann were the defending champions but chose not to defend their title.
Constantin Frantzen and Hendrik Jebens were the defending champions but chose not to defend their title.
Zdeněk Kolář and Blaž Rola were the defending champions but only Rola chose to defend his title, partnering Mohamed Safwat. They lost in the first round to Gerald Melzer and Lukas Neumayer.
Marco Bortolotti and Alexandru Jecan were the defending champions but chose to defend their title with different partners. Bortolotti partnered Daniel Cukierman but lost in the final to Théo Arribagé and Francisco Cabral. Jecan partnered Ivan Liutarevich but lost in the semifinals to Arribagé and Cabral.
Sriram Balaji and Andre Begemann were the defending champions but chose not to defend their title.