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| Quarter-finals | Ovcharenko O. | Saitoh K. | 2:0 (7:62, 7:5) | dettagli | 30.01.2026 | ||
| 1/8-finals | Saitoh K. | Castagnola L. | 2:1 (4:6, 7:5, 7:5) | dettagli | 29.01.2026 | ||
| 1/16-finals | Sahtali T. | Saitoh K. | 0:2 (0:6, 1:6) | dettagli | 28.01.2026 | ||
| 1/8-finals | Sakellaridis D. | Saitoh K. | 2:0 (6:1, 6:4) | dettagli | 23.01.2026 | ||
| 1/16-finals | Saitoh K. | Nesterov P. | 2:1 (6:4, 4:6, 7:65) | dettagli | 22.01.2026 | ||
| Semi-finals | Pokorny L. | Saitoh K. | 2:0 (6:0, 6:4) | dettagli | 17.01.2026 | ||
| Quarter-finals | Sakellaridis D. | Saitoh K. | 0:2 (3:6, 4:6) | dettagli | 17.01.2026 | ||
| 1/8-finals | Saitoh K. | Agafonov E. | 2:0 (7:5, 7:5) | dettagli | 15.01.2026 | ||
| 1/16-finals | Luis T. | Saitoh K. | 0:2 (2:6, 3:6) | dettagli | 14.01.2026 | ||
| Quarter-finals | Saitoh K. | Kim G. J. | 0:2 (4:6, 2:6) | dettagli | 28.11.2025 | ||
| 1/8-finals | Saitoh K. | Lee W. B. | 2:0 (7:65, 6:3) | dettagli | 27.11.2025 | ||
| 1/16-finals | Saitoh K. | Kim D. J. | 2:1 (66:7, 6:4, 7:67) | dettagli | 26.11.2025 | ||
| Quarter-finals | Dean T. | Saitoh K. | 2:0 (6:1, 6:0) | dettagli | 21.11.2025 | ||
| 1/8-finals | Jang Y. | Saitoh K. | 0:2 (1:6, 2:6) | dettagli | 20.11.2025 | ||
| 1/16-finals | Suzuki K. | Saitoh K. | 0:2 (1:6, 2:6) | dettagli | 18.11.2025 | ||
| Semi-finals | Matsuda K. | Saitoh K. | 2:1 (7:5, 5:7, 6:4) | dettagli | 02.11.2025 | ||
| Semi-finals | Bouzige M. | Saitoh K. | 2:0 (7:66, 6:4) | dettagli | 01.11.2025 | ||
| Quarter-finals | Kawahashi Y. | Saitoh K. | 1:2 (6:4, 4:6, 2:6) | dettagli | 31.10.2025 | ||
| 1/8-finals | Muto S. | Saitoh K. | 0:2 (2:6, 2:6) | dettagli | 30.10.2025 | ||
| 1/16-finals | Kim G. J. | Saitoh K. | 1:2 (6:4, 1:6, 3:6) | dettagli | 28.10.2025 | ||
| 1/8-finals | Takahashi Y. | Saitoh K. | 2:0 (7:61, 6:0) | dettagli | 18.09.2025 | ||
| 1/16-finals | Matsuda K. | Saitoh K. | 1:2 (3:6, 6:4, 2:6) | dettagli | 17.09.2025 | ||
| 1/16-finals | Saitoh K. | Imamura M. | 0:2 (3:6, 3:6) | dettagli | 10.09.2025 | ||
| 1/16-finals | Nakagawa N. | Saitoh K. | 2:0 (6:4, 6:4) | dettagli | 02.09.2025 | ||
| 1/8-finals | Saitoh K. | Kwon S. | 0:2 (2:6, 0:6) | dettagli | 28.08.2025 | ||
| 1/16-finals | Park Y. J. | Saitoh K. | 0:2 (2:6, 2:6) | dettagli | 27.08.2025 | ||
| 1/16-finals | Saitoh K. | Imamura M. | 0:2 (3:6, 4:6) | dettagli | 19.08.2025 | ||
| 1/16-finals | Saitoh K. | Dong C. | 0:2 (3:6, 4:6) | dettagli | 12.08.2025 | ||
| Semi-finals | Samrej K. | Saitoh K. | 2:0 (6:3, 6:1) | dettagli | 09.08.2025 | ||
| Quarter-finals | Saitoh K. | Habib A. | 2:0 (7:5, 6:0) | dettagli | 08.08.2025 | ||
| 1/8-finals | Saitoh K. | Alhogbani A. F. | 2:0 (6:2, 6:3) | dettagli | 07.08.2025 | ||
| Quarter-finals | Barbieri A./Colombo A. | Saitoh K./Yamanaka T. | WO. | dettagli | 24.01.2026 | ||
| 1/8-finals | Saitoh K./Yamanaka T. | Ovcharenko O./Perez Contri S. | 2:1 (0:6, 6:4, 10:3) | dettagli | 23.01.2026 | ||
| Quarter-finals | Van Herck L./Vankan M. | Saitoh K./Yamanaka T. | 2:0 (7:63, 6:2) | dettagli | 15.01.2026 | ||
| 1/8-finals | Saitoh K./Yamanaka T. | Alkaya M./Johansson O. | 2:0 (6:2, 6:2) | dettagli | 13.01.2026 | ||
| 1/8-finals | Ann S./Kang Ku K. | Inui Y./Saitoh K. | 2:1 (5:7, 6:3, 10:8) | dettagli | 25.11.2025 | ||
| Quarter-finals | Inui Y./Saitoh K. | Dean T./Hashimoto H. | 0:2 (3:6, 3:6) | dettagli | 20.11.2025 | ||
| 1/8-finals | Inui Y./Saitoh K. | Park Y. J./Qabazard E. | 2:0 (6:4, 6:2) | dettagli | 19.11.2025 | ||
| 1/8-finals | Saitoh K./Yamanaka T. | Shick B./Tanuma R. | 1:2 (5:7, 6:0, 9:11) | dettagli | 28.10.2025 | ||
| Final | Saitoh K./Yamanaka T. | Oki Y./Vithoontien L. | 2:1 (7:64, 4:6, 10:8) | dettagli | 20.09.2025 | ||
| Semi-finals | Saitoh K./Yamanaka T. | Ogura K./Sueoka Y. | 2:0 (6:3, 7:5) | dettagli | 19.09.2025 | ||
| Quarter-finals | Uchida K./Uesugi K. | Saitoh K./Yamanaka T. | WO. | dettagli | 18.09.2025 | ||
| 1/8-finals | Masabayashi T./Sumizawa D. | Saitoh K./Yamanaka T. | 1:2 (2:6, 6:3, 7:10) | dettagli | 16.09.2025 | ||
| Final | Mochizuki Y./Noguchi M. | Saitoh K./Sumizawa D. | 2:0 (6:3, 6:3) | dettagli | 14.09.2025 | ||
| Semi-finals | Saitoh K./Sumizawa D. | Honda N./Matsuoka H. | 2:1 (5:7, 6:2, 10:7) | dettagli | 12.09.2025 | ||
| Quarter-finals | Saitoh K./Sumizawa D. | Ichikawa T./Isomura K. | 2:0 (7:64, 6:2) | dettagli | 12.09.2025 | ||
| 1/8-finals | Katayama S./Kusuhara Y. | Saitoh K./Sumizawa D. | 0:2 (3:6, 3:6) | dettagli | 09.09.2025 | ||
| 1/8-finals | Lo Y. J./Yin B. S. | Kumasaka T./Saitoh K. | CAN. | dettagli | 20.08.2025 | ||
| Quarter-finals | Ogura K./Saitoh K. | Shanmugam A./Sureshkumar M. | 0:2 (3:6, 5:7) | dettagli | 14.08.2025 | ||
| 1/8-finals | Ogura K./Saitoh K. | Koh L./Wong M. Z. | 2:0 (6:2, 6:1) | dettagli | 12.08.2025 | ||