 Tunisia: M15 Monastir 19 - Doubles - Main |
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| Quarter-finals | Kawachi K./Yamasaki J. | Schell N./Singh K. | 0:2 (3:6, 2:6) | details | 10.05.2024 |
| 1/8-finals | Kawachi K./Yamasaki J. | Beaven J./McLaren M. | 2:1 (5:7, 6:3, 10:6) | details | 07.05.2024 |
 Japan: M15 Kashiwa - Doubles - Main |
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| Quarter-finals | Kawachi K./Tokuda R. | Ho R./Nam Ji S. | WO. | details | 04.04.2024 |
| 1/8-finals | Ito T./Katayama S. | Kawachi K./Tokuda R. | 1:2 (3:6, 7:5, 6:10) | details | 02.04.2024 |
| Japan: M15 Tsukuba - Doubles - Main |
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| Quarter-finals | Kusuhara Y./Nakagawa S. | Kawachi K./Saitoh K. | 2:1 (6:3, 4:6, 10:7) | details | 28.03.2024 |
| 1/8-finals | Kawachi K./Saitoh K. | Matsuda K./Takeru Y. | 2:0 (7:63, 6:4) | details | 27.03.2024 |
 India: M15 Chandigarh - Doubles - Main |
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| Semi-finals | Chanta T./Kawachi K. | Jang Y./Shin W. | 0:2 (2:6, 64:7) | details | 22.03.2024 |
| Quarter-finals | Chanta T./Kawachi K. | Hans K./Sultanov K. | 2:0 (6:4, 6:4) | details | 21.03.2024 |
| 1/8-finals | Dev S D P./Sinha N. K. | Chanta T./Kawachi K. | 0:2 (4:6, 2:6) | details | 19.03.2024 |
| India: M25 New Delhi - Doubles - Main |
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| Semi-finals | Somani P./Sureshkumar M. | Kawachi K./Shin W. | 2:0 (6:0, 6:3) | details | 15.03.2024 |
| Quarter-finals | Kawachi K./Shin W. | Sinha N. K./Vishwakarma S. | 2:0 (6:4, 6:4) | details | 14.03.2024 |
| 1/8-finals | Kawachi K./Shin W. | Jaisinghani R./Vishal Balsekar A. | 2:0 (6:2, 6:0) | details | 12.03.2024 |
| Japan: M15 Yanagawa 2 - Doubles - Main |
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| Final | Katayama S./Nakagawa S. | Kawachi K./Sueoka Y. | 2:0 (6:2, 6:3) | details | 30.12.2023 |
| Semi-finals | Kawachi K./Sueoka Y. | Kusuhara Y./Shiraishi H. | 2:0 (6:4, 6:2) | details | 29.12.2023 |
| Quarter-finals | Horiuchi R./Takamisawa T. | Kawachi K./Sueoka Y. | 0:2 (4:6, 3:6) | details | 28.12.2023 |
| 1/8-finals | Fu H./Lu C. | Kawachi K./Sueoka Y. | 0:2 (5:7, 4:6) | details | 26.12.2023 |
| Japan: M15 Yanagawa - Doubles - Main |
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| Quarter-finals | Kawachi K./Nishiwaki K. | Inui Y./Suzuki K. | 0:2 (5:7, 4:6) | details | 23.12.2023 |
| 1/8-finals | Nakagawa S./Ogura K. | Kawachi K./Nishiwaki K. | 1:2 (4:6, 6:3, 6:10) | details | 23.12.2023 |
| India: M25 Mumbai - Doubles - Main |
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| Quarter-finals | Kawachi K./Matsuda K. | Dev S D P./Sinha N. K. | 1:2 (1:6, 6:3, 4:10) | details | 23.11.2023 |
| 1/8-finals | Madan T./Vishwakarma S. | Kawachi K./Matsuda K. | 0:2 (4:6, 1:6) | details | 21.11.2023 |
 Malaysia: M15 Kuching - Doubles - Main |
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| 1/8-finals | Fukuda S./Kawachi K. | Trongcharoenchaikul W./Yin B. S. | 0:2 (4:6, 4:6) | details | 16.11.2023 |
| Japan: M25 Takasaki - Doubles - Main |
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| Final | Watanabe S./Takeru Y. | Ichikawa T./Kawachi K. | 2:1 (6:4, 2:6, 10:5) | details | 23.09.2023 |
| Semi-finals | Ichikawa T./Kawachi K. | Kono Y./Kusuhara Y. | 2:1 (6:3, 64:7, 10:4) | details | 22.09.2023 |
| Quarter-finals | Leong M. W. K./Vithoontien L. | Ichikawa T./Kawachi K. | 0:2 (4:6, 2:6) | details | 21.09.2023 |
| 1/8-finals | Jang Y./Matsuda K. | Ichikawa T./Kawachi K. | 0:2 (3:6, 2:6) | details | 19.09.2023 |
| Japan: M25 Sapporo 2 - Doubles - Main |
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| Quarter-finals | Kawachi K./Sumizawa D. | Nakagawa S./Ogura K. | 1:2 (2:6, 6:4, 2:10) | details | 14.09.2023 |
| 1/8-finals | Kawachi K./Sumizawa D. | Jang Y./Shin W. | 2:0 (6:2, 6:2) | details | 13.09.2023 |
| Tunisia: M15 Monastir 34 - Doubles - Main |
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| 1/8-finals | Seggerman R./Trhac P. | Johns G./Kawachi K. | 2:0 (6:3, 6:1) | details | 22.08.2023 |
| Tunisia: M15 Monastir 33 - Doubles - Main |
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| Quarter-finals | Johns G./Kawachi K. | Fantini L./Lalami Laaroussi Y. | 0:2 (4:6, 2:6) | details | 17.08.2023 |
| 1/8-finals | Johns G./Kawachi K. | Philibert N./Sibille I. | 2:0 (6:1, 6:2) | details | 16.08.2023 |
 Israel: M25 Herzlia - Doubles - Main |
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| Quarter-finals | Davis J./Jones B. | Kawachi K./Okamura I. | 2:0 (6:2, 6:2) | details | 10.08.2023 |
| 1/8-finals | Kawachi K./Okamura I. | Gray T./Xilas I. | 2:0 (6:2, 6:3) | details | 08.08.2023 |
Ethiopia: M15 Addis Ababa - Doubles - Main