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| Semi-finals | Sornlaksup P. | Kumasaka T. | 2:1 (6:4, 63:7, 6:3) | details | 12.04.2026 | ||
| Semi-finals | Kumasaka T. | Nam Ji S. | 0:2 (2:6, 4:6) | details | 29.03.2026 | ||
| Final | Sun F. | Kumasaka T. | 2:0 (6:2, 6:2) | details | 23.03.2026 | ||
| Semi-finals | Mitsui S. | Kumasaka T. | 0:1 RET. (4:6, 0:1) | details | 22.03.2026 | ||
| 1/16-finals | Kikuchi Y. | Kumasaka T. | 2:0 (6:0, 7:66) | details | 10.03.2026 | ||
| Final | Alkaya M. | Kumasaka T. | CAN. | details | 04.03.2026 | ||
| Semi-finals | Nakagawa S. | Kumasaka T. | 0:2 (64:7, 3:6) | details | 02.03.2026 | ||
| 1/16-finals | Kumasaka T. | Cina F. | 0:2 (1:6, 0:6) | details | 24.02.2026 | ||
| Final | Dev S D P. | Kumasaka T. | 0:2 (4:6, 2:6) | details | 23.02.2026 | ||
| Semi-finals | Rawat S. | Kumasaka T. | 0:2 (4:6, 4:6) | details | 22.02.2026 | ||
| 1/16-finals | Ouakaa A. | Kumasaka T. | 2:1 (7:5, 65:7, 6:4) | details | 13.01.2026 | ||
| Semi-finals | Kumasaka T. | Taguchi R. | 0:2 (5:7, 1:6) | details | 04.01.2026 | ||
| 1/16-finals | Kumasaka T. | Hijikata R. | 0:2 (2:6, 0:6) | details | 25.11.2025 | ||
| Final | Kumasaka T. | Vithoontien L. | 2:0 (6:3, 6:2) | details | 24.11.2025 | ||
| Semi-finals | Kumasaka T. | Hulme M. | 2:0 (7:65, 6:4) | details | 23.11.2025 | ||
| 1/16-finals | Kumasaka T. | Bolt A. | 0:2 (3:6, 4:6) | details | 18.11.2025 | ||
| Final | Kumasaka T. | Vithoontien L. | 1:2 (4:6, 6:3, 2:6) | details | 10.11.2025 | ||
| Semi-finals | Kumasaka T. | Sumizawa D. | 2:1 (6:4, 4:6, 6:1) | details | 09.11.2025 | ||
| 1/16-finals | Kumasaka T. | Peniston R. | 0:2 (0:6, 1:6) | details | 04.11.2025 | ||
| Final | Kumasaka T. | Matsuoka H. | 2:1 (5:7, 6:1, 7:62) | details | 03.11.2025 | ||
| Semi-finals | Kumasaka T. | Ito T. | 2:0 (6:2, 6:0) | details | 02.11.2025 | ||
| Final | Samrej K. | Kumasaka T. | 2:0 (6:2, 6:1) | details | 27.10.2025 | ||
| Semi-finals | Kumasaka T. | Zhukov M. | 2:1 (3:6, 6:4, 6:1) | details | 26.10.2025 | ||
| 1/8-finals | Kumasaka T. | Shimizu Y. | 1:2 (0:6, 7:5, 64:7) | details | 23.10.2025 | ||
| 1/16-finals | Kumasaka T. | Jasika O. | 2:0 (7:5, 6:4) | details | 21.10.2025 | ||
| Final | Zhu E. | Kumasaka T. | 0:2 (1:6, 3:6) | details | 20.10.2025 | ||
| Semi-finals | Watanabe S. | Kumasaka T. | 1:2 (3:6, 6:3, 4:6) | details | 20.10.2025 | ||
| Semi-finals | Kumasaka T. | Uchida K. | 0:2 (2:6, 3:6) | details | 20.09.2025 | ||
| Quarter-finals | Yamasaki J. | Kumasaka T. | 1:2 (7:66, 0:6, 3:6) | details | 19.09.2025 | ||
| 1/8-finals | Sumizawa D. | Kumasaka T. | 1:2 (6:3, 5:7, 61:7) | details | 18.09.2025 | ||
| 1/16-finals | Atlangeriev B. | Kumasaka T. | 0:2 (3:6, 2:6) | details | 16.09.2025 | ||
| 1/16-finals | Uchida K. | Kumasaka T. | 2:0 (6:3, 6:4) | details | 10.09.2025 | ||
| Semi-finals | Kumasaka T. | Uchida K. | 0:2 (4:6, 66:7) | details | 06.09.2025 | ||
| Quarter-finals | Nakagawa N. | Kumasaka T. | 0:2 (3:6, 3:6) | details | 05.09.2025 | ||
| 1/8-finals | Brumm J. | Kumasaka T. | 1:2 (4:6, 7:64, 1:6) | details | 04.09.2025 | ||
| 1/16-finals | Horie T. | Kumasaka T. | 0:2 (2:6, 4:6) | details | 03.09.2025 | ||
| 1/16-finals | Taguchi R. | Kumasaka T. | 1:1 RET. (65:7, 6:4) | details | 19.08.2025 | ||
| Quarter-finals | Zhang T. | Kumasaka T. | 2:0 (6:1, 6:2) | details | 15.08.2025 | ||
| 1/8-finals | Trongcharoenchaikul W. | Kumasaka T. | 0:2 (4:6, 4:6) | details | 14.08.2025 | ||
| 1/16-finals | Tang S. | Kumasaka T. | 0:2 (0:6, 4:6) | details | 13.08.2025 | ||
| 1/16-finals | Kumasaka T. | Budkov Kjaer N. | 0:2 (3:6, 4:6) | details | 30.07.2025 | ||
| Quarter-finals | Kumasaka T./Matsuda K. | Broady L./Wendelken H. | 0:2 (4:6, 2:6) | details | 02.04.2026 | ||
| 1/8-finals | Kumasaka T./Matsuda K. | Sun F./Wu Tung-Lin | 2:0 (6:2, 6:4) | details | 01.04.2026 | ||
| 1/8-finals | Kumasaka T./Noguchi R. | Clarke J./Geerts M. | 0:2 (3:6, 4:6) | details | 25.02.2026 | ||
| 1/8-finals | Cook E./Hudd E. | Kumasaka T./Singh K. | 2:0 (6:1, 6:2) | details | 26.11.2025 | ||
| 1/8-finals | Chandrasekar A./Stalder R. | Kumasaka T./Wu Tung-Lin | 2:1 (4:6, 6:1, 10:3) | details | 19.11.2025 | ||
| Semi-finals | Oki Y./Vithoontien L. | Kumasaka T./Yamasaki J. | 2:0 (6:2, 6:3) | details | 19.09.2025 | ||
| Quarter-finals | Kumasaka T./Yamasaki J. | Blando J./Blando M. | 2:1 (6:4, 2:6, 10:5) | details | 18.09.2025 | ||
| 1/8-finals | Katayama K./Nakano R. | Kumasaka T./Yamasaki J. | 0:2 (5:7, 2:6) | details | 16.09.2025 | ||
| 1/8-finals | Lo Y. J./Yin B. S. | Kumasaka T./Saitoh K. | CAN. | details | 20.08.2025 | ||