Select tournament type
| Semi-finals | Watt J. | Sumizawa D. | 2:0 (6:3, 6:4) | details | 04.01.2026 | ||
| Semi-finals | Sumizawa D. | Yamanaka T. | 0:2 (3:6, 0:6) | details | 16.11.2025 | ||
| Semi-finals | Kumasaka T. | Sumizawa D. | 2:1 (6:4, 4:6, 6:1) | details | 09.11.2025 | ||
| Semi-finals | Yuzuki T. | Sumizawa D. | 2:0 (6:4, 6:3) | details | 02.11.2025 | ||
| 1/8-finals | Sumizawa D. | Tomida Y. | 0:2 (1:6, 3:6) | details | 23.10.2025 | ||
| 1/16-finals | Sumizawa D. | Cho Seung Woo | 2:0 (6:2, 6:2) | details | 21.10.2025 | ||
| 1/8-finals | Sumizawa D. | Kumasaka T. | 1:2 (6:3, 5:7, 61:7) | details | 18.09.2025 | ||
| 1/16-finals | Sumizawa D. | Brumm J. | 2:0 (7:65, 6:2) | details | 17.09.2025 | ||
| 1/8-finals | Sumizawa D. | Broom C. | 0:2 (2:6, 2:6) | details | 04.09.2025 | ||
| 1/16-finals | Kusuhara Y. | Sumizawa D. | 0:2 (1:6, 4:6) | details | 02.09.2025 | ||
| 1/8-finals | Sumizawa D. | Erel Y. | 0:2 (2:6, 2:6) | details | 28.08.2025 | ||
| 1/16-finals | Sumizawa D. | Arcon A. | 2:1 (2:6, 6:4, 6:0) | details | 26.08.2025 | ||
| 1/16-finals | Lee J. | Sumizawa D. | 2:1 (3:6, 6:4, 6:1) | details | 20.08.2025 | ||
| Semi-finals | Sumizawa D. | Kikuchi Y. | 0:2 (3:6, 2:6) | details | 02.08.2025 | ||
| Quarter-finals | Zhang T. | Sumizawa D. | 1:1 RET. (6:3, 2:6, 0:3) | details | 01.08.2025 | ||
| 1/8-finals | Ochi M. | Sumizawa D. | 1:2 (3:6, 6:4, 5:7) | details | 31.07.2025 | ||
| 1/16-finals | Hirose Y. | Sumizawa D. | 0:2 (3:6, 1:6) | details | 30.07.2025 | ||
| Final | Shin S. | Sumizawa D. | 2:0 (6:4, 6:0) | details | 27.07.2025 | ||
| Semi-finals | Sumizawa D. | Nidunjianzan F. | 2:0 (7:68, 6:1) | details | 26.07.2025 | ||
| Quarter-finals | Ferguson C. | Sumizawa D. | 0:2 (3:6, 2:6) | details | 25.07.2025 | ||
| 1/8-finals | Liu H. | Sumizawa D. | 1:2 (3:6, 6:1, 2:6) | details | 24.07.2025 | ||
| 1/16-finals | Tan J. D. | Sumizawa D. | 0:2 (2:6, 0:6) | details | 23.07.2025 | ||
| 1/16-finals | Sumizawa D. | Pan W. | 0:2 (3:6, 3:6) | details | 08.07.2025 | ||
| Quarter-finals | Sumizawa D. | Samrej K. | 0:2 (2:6, 2:6) | details | 04.07.2025 | ||
| 1/8-finals | Xiao L. | Sumizawa D. | 1:2 (7:63, 4:6, 66:7) | details | 03.07.2025 | ||
| 1/16-finals | Sumizawa D. | Zhang M. | 2:0 (7:5, 6:1) | details | 02.07.2025 | ||
| 1/16-finals | Sumizawa D. | Castelnuovo L. | CAN. | details | 02.07.2025 | ||
| 1/16-finals | Naumovski M. | Sumizawa D. | 0:1 RET. (1:6, 4:1) | details | 03.06.2025 | ||
| Semi-finals | Sumizawa D. | Cui J. | 0:2 (3:6, 1:6) | details | 31.05.2025 | ||
| Quarter-finals | Yamanaka T. | Sumizawa D. | 0:2 (63:7, 4:6) | details | 30.05.2025 | ||
| 1/8-finals | Sumizawa D. | Mo Y. C. | 1:1 RET. (4:6, 6:3, 4:2) | details | 29.05.2025 | ||
| 1/16-finals | Sumizawa D. | Sun Qian | 2:0 (7:5, 6:2) | details | 27.05.2025 | ||
| Quarter-finals | Sinclair C./Sumizawa D. | Reynolds F./Watt J. | 1:2 (7:64, 3:6, 5:10) | details | 07.01.2026 | ||
| 1/8-finals | Brown P./Mehrotra A. | Sinclair C./Sumizawa D. | 0:2 (5:7, 4:6) | details | 06.01.2026 | ||
| 1/8-finals | Koyama H./Suzuki K. | Sumizawa D./Tomida Y. | 2:1 (65:7, 6:3, 11:9) | details | 22.10.2025 | ||
| 1/8-finals | Masabayashi T./Sumizawa D. | Saitoh K./Yamanaka T. | 1:2 (2:6, 6:3, 7:10) | details | 16.09.2025 | ||
| Final | Mochizuki Y./Noguchi M. | Saitoh K./Sumizawa D. | 2:0 (6:3, 6:3) | details | 14.09.2025 | ||
| Semi-finals | Saitoh K./Sumizawa D. | Honda N./Matsuoka H. | 2:1 (5:7, 6:2, 10:7) | details | 12.09.2025 | ||
| Quarter-finals | Saitoh K./Sumizawa D. | Ichikawa T./Isomura K. | 2:0 (7:64, 6:2) | details | 12.09.2025 | ||
| 1/8-finals | Katayama S./Kusuhara Y. | Saitoh K./Sumizawa D. | 0:2 (3:6, 3:6) | details | 09.09.2025 | ||
| Quarter-finals | Broom C./Whitehouse M. | Okamura I./Sumizawa D. | 2:1 (4:6, 6:2, 10:8) | details | 04.09.2025 | ||
| 1/8-finals | Okamura I./Sumizawa D. | Blando J./Blando M. | 2:1 (6:4, 1:6, 10:7) | details | 02.09.2025 | ||
| 1/8-finals | Mitsui S./Sumizawa D. | Lee K./Lin N. H. | 1:2 (7:5, 5:7, 4:10) | details | 27.08.2025 | ||
| Quarter-finals | Sumizawa D./Takahata R. | Rifqi Fitriadi M./Lee J. | 1:2 (2:6, 6:4, 6:10) | details | 21.08.2025 | ||
| 1/8-finals | Sumizawa D./Takahata R. | Kitthachok K./Majoli Maggioli T. T. | 2:0 (6:3, 6:2) | details | 20.08.2025 | ||
| 1/8-finals | Inui Y./Sumizawa D. | Chen X./Hsieh C. | 1:2 (4:6, 6:1, 8:10) | details | 22.07.2025 | ||
| 1/8-finals | Matsuda K./Sumizawa D. | Santillan A./Yang M. | 0:2 (5:7, 3:6) | details | 09.07.2025 | ||
| Quarter-finals | Chanta T./Sornlaksup P. | Sumizawa D./Trongcharoenchaikul W. | 2:0 (6:3, 7:5) | details | 03.07.2025 | ||
| 1/8-finals | Sumizawa D./Trongcharoenchaikul W. | Jin Y./Li Z. | 2:1 (7:63, 64:7, 11:9) | details | 01.07.2025 | ||
| 1/8-finals | Fukuda S./Sumizawa D. | Wang Y./Zheng B. | 0:2 (4:6, 3:6) | details | 27.05.2025 | ||