 South Korea: M25 Changwon - Doubles - Main |
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| Semi-finals | Chung H./Son J. H. | Ferguson C./Sumizawa D. | 2:0 (7:64, 6:1) | details | 21.06.2024 |
| Quarter-finals | Isomura K./Taguchi R. | Ferguson C./Sumizawa D. | WO. | details | 20.06.2024 |
| 1/8-finals | Jeong Y./Park U. | Ferguson C./Sumizawa D. | 1:2 (6:4, 2:6, 6:10) | details | 18.06.2024 |
 Hong Kong: M15 Hong Kong - Doubles - Main |
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| Semi-finals | Sueoka Y./Sumizawa D. | Masabayashi T./Suksumrarn T. | 1:2 (3:6, 6:3, 7:10) | details | 14.06.2024 |
| Quarter-finals | Sueoka Y./Sumizawa D. | Suzuki K./Yamanaka T. | 2:0 (6:2, 6:2) | details | 13.06.2024 |
| 1/8-finals | Sueoka Y./Sumizawa D. | Lu P./Zhang L. | 2:0 (6:2, 6:2) | details | 13.06.2024 |
 Serbia: M15 Kursumlijska Banja 4 - Doubles - Main |
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| Final | Donev G./Ivanov S. A. | Saitoh K./Sumizawa D. | 0:2 (4:6, 0:6) | details | 18.05.2024 |
| Semi-finals | Saitoh K./Sumizawa D. | Kielan S./Markovski O. | 2:0 (6:2, 6:1) | details | 17.05.2024 |
| Quarter-finals | Ludoski Z./Matsuoka H. | Saitoh K./Sumizawa D. | 1:2 (6:4, 3:6, 9:11) | details | 16.05.2024 |
| 1/8-finals | Chambonniere M./Larue L. | Saitoh K./Sumizawa D. | 0:2 (1:6, 3:6) | details | 15.05.2024 |
| Serbia: M25 Kursumlijska Banja - Doubles - Main |
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| Semi-finals | Saitoh K./Sumizawa D. | Donev G./Juhas K. | 0:2 (4:6, 4:6) | details | 10.05.2024 |
| Quarter-finals | Frusina A./Ghibaudo A. | Saitoh K./Sumizawa D. | 1:2 (62:7, 6:2, 7:10) | details | 09.05.2024 |
| 1/8-finals | Shandarov R./Shandarov V. | Saitoh K./Sumizawa D. | 0:2 (0:6, 1:6) | details | 08.05.2024 |
| Serbia: M15 Kursumlijska Banja 3 - Doubles - Main |
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| Quarter-finals | Saitoh K./Sumizawa D. | Demanet E./Loge J. | 1:2 (4:6, 7:5, 6:10) | details | 02.05.2024 |
| 1/8-finals | Saitoh K./Sumizawa D. | Hess S./Valle F. | 2:0 (6:2, 6:3) | details | 30.04.2024 |
 Japan: M15 Kashiwa - Doubles - Main |
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| Quarter-finals | Saitoh K./Sumizawa D. | Huang T./Jeong Y. | 0:2 (4:6, 4:6) | details | 04.04.2024 |
| 1/8-finals | Kono S./Okamura I. | Saitoh K./Sumizawa D. | 0:2 (1:6, 1:6) | details | 02.04.2024 |
| Japan: M15 Tsukuba - Doubles - Main |
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| 1/8-finals | Shin S./Sumizawa D. | Chung Y./Jeong Y. | 0:2 (1:6, 4:6) | details | 27.03.2024 |
| Japan: M15 Nishi-Tokyo - Doubles - Main |
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| Quarter-finals | Saitoh K./Yamanaka T. | Sumizawa D./Taguchi R. | 2:0 (7:65, 6:3) | details | 21.03.2024 |
| 1/8-finals | Sumizawa D./Taguchi R. | Chung Y./Jeong Y. | 2:1 (4:6, 7:62, 10:5) | details | 21.03.2024 |
| Japan: M15 Hinode - Doubles - Main |
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| 1/8-finals | Kono Y./Sumizawa D. | Lee D. H./Saitoh K. | 0:2 (4:6, 5:7) | details | 14.03.2024 |
| Japan: M15 Yanagawa - Doubles - Main |
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| 1/8-finals | Kawahashi Y./Sumizawa D. | Matsuda K./Shiraishi H. | CAN. | details | 21.12.2023 |
 Australia: M25 Gold Coast - Doubles - Main |
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| 1/8-finals | Delaney Ja./Imai S. | Masabayashi T./Sumizawa D. | 2:0 (6:3, 6:4) | details | 30.11.2023 |
| Australia: M25 Brisbane - Doubles - Main |
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| 1/8-finals | Fancutt T. J./Rai A. | Imai S./Sumizawa D. | 2:1 (65:7, 6:3, 10:8) | details | 23.11.2023 |
| Australia: M25 Cairns 2 - Doubles - Main |
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| 1/8-finals | Beale J./Fancutt T. J. | Inoue G./Sumizawa D. | 2:1 (2:6, 6:4, 10:8) | details | 11.10.2023 |
| Australia: M25 Cairns - Doubles - Main |
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| 1/8-finals | Ochi M./Sumizawa D. | Peliwo F./Rai A. | 0:2 (4:6, 2:6) | details | 03.10.2023 |
| Japan: M25 Takasaki - Doubles - Main |
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| Quarter-finals | Kono Y./Kusuhara Y. | Saitoh K./Sumizawa D. | 2:0 (6:1, 6:3) | details | 21.09.2023 |
| 1/8-finals | Hashimoto K./Tani S. | Saitoh K./Sumizawa D. | 0:2 (3:6, 1:6) | details | 20.09.2023 |