Australia: M25 Traralgon 2 - Doubles - Main |
| Quarter-finals | Han Seon Yong/Okamura I. | Delaney Je./Rai A. | 0:2 (3:6, 1:6) | details | 29.02.2024 |
| 1/8-finals | Mehrotra A./Tu L. | Han Seon Yong/Okamura I. | 0:2 (4:6, 4:6) | details | 28.02.2024 |
Australia: M25 Traralgon - Doubles - Main |
| Quarter-finals | Bayldon B./Pearson K. | Okamura I./Sach T. | 2:0 (6:3, 7:5) | details | 22.02.2024 |
| 1/8-finals | Okamura I./Sach T. | Cook E./Court J. | 2:1 (7:63, 4:6, 10:4) | details | 20.02.2024 |
Qatar: M15 Doha - Doubles - Main |
| 1/8-finals | Kopp S./Okamura I. | Palosi S./Tomescu D. A. | 0:2 (1:6, 4:6) | details | 09.01.2024 |
Kuwait: M15 Al Zahra 2 - Doubles - Main |
| 1/8-finals | Bataljin L./Okamura I. | De Carvalho V./Oliveira G. | 0:2 (64:7, 2:6) | details | 31.10.2023 |
Australia: M25 Darwin 2 - Doubles - Main |
| 1/8-finals | Okamura I./Takamisawa T. | Mott B./Patton T. | 0:2 (3:6, 4:6) | details | 20.09.2023 |
Australia: M25 Darwin - Doubles - Main |
| 1/8-finals | Crowther C./Sach T. | Bouzige M./Okamura I. | 2:0 (6:3, 7:64) | details | 12.09.2023 |
Japan: M25 Sapporo - Doubles - Main |
| 1/8-finals | Sekiguchi S./Sumizawa D. | Inui Y./Okamura I. | 2:0 (7:5, 6:4) | details | 06.09.2023 |
Taiwan: M25 Tainan 2 - Doubles - Main |
| 1/8-finals | Masabayashi T./Matsuda K. | Kumasaka T./Okamura I. | 2:0 (6:2, 6:3) | details | 22.08.2023 |
Taiwan: M25 Tainan - Doubles - Main |
| Quarter-finals | Kumasaka T./Okamura I. | Ochi M./Takeru Y. | 0:2 (2:6, 3:6) | details | 17.08.2023 |
| 1/8-finals | Kumasaka T./Okamura I. | Denisov I./Sheyngezikht L. | 2:1 (6:4, 65:7, 11:9) | details | 15.08.2023 |
Israel: M25 Herzlia - Doubles - Main |
| 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 |
Israel: M15 Raanana - Doubles - Main |
| Semi-finals | Goldenberg L./Oliel Y. | Kawachi K./Okamura I. | 2:0 (6:2, 6:3) | details | 03.08.2023 |
| Quarter-finals | Ellouck R./Hasson J. | Kawachi K./Okamura I. | 1:2 (3:6, 7:5, 11:13) | details | 02.08.2023 |
| 1/8-finals | Ginat R./Zuckerman N. | Kawachi K./Okamura I. | 0:2 (2:6, 3:6) | details | 31.07.2023 |
Indonesia: M15 Jakarta 5 - Doubles - Main |
| 1/8-finals | Susanto A./Susanto D. A. | Okamura I./Sumizawa D. | 2:0 (7:62, 7:62) | details | 28.06.2023 |
South Korea: M25 Anseong - Doubles - Main |
| 1/8-finals | Lee J. M./Song M.-K. | Kumasaka T./Okamura I. | 2:0 (6:1, 6:3) | details | 20.06.2023 |
South Korea: M25 Changwon - Doubles - Main |
| 1/8-finals | Kim G. J./Okamura I. | Mitsui S./Saitoh K. | 0:2 (0:6, 63:7) | details | 13.06.2023 |
South Korea: M25 Daegu - Doubles - Main |
| 1/8-finals | Kumasaka T./Okamura I. | Jang Y./Shin W. | 1:2 (6:4, 2:6, 8:10) | details | 06.06.2023 |
Japan: M15 Karuizawa - Doubles - Main |
| 1/8-finals | Katayama S./Okamura I. | Han Seon Yong/Shin S. | 0:2 (2:6, 4:6) | details | 01.06.2023 |
United Kingdom: M25 Nottingham 2 - Doubles - Main |
| 1/8-finals | Okamura I./Reco A. | Tyler J./Wendelken H. | 0:2 (1:6, 4:6) | details | 26.04.2023 |
Japan: M25 Tsukuba - Doubles - Main |
| 1/8-finals | Ochi M./Tokuda R. | Nishiwaki K./Okamura I. | 2:0 (6:2, 6:3) | details | 29.03.2023 |
Kazakhstan: M15 Aktobe 2 - Doubles - Main |
| Semi-finals | Bertuccioli F./De Rossi M. | Kawachi K./Okamura I. | 2:1 (7:5, 62:7, 10:5) | details | 10.03.2023 |
| Quarter-finals | Dadabaev A./Ibrakhimov R. | Kawachi K./Okamura I. | 0:2 (3:6, 3:6) | details | 09.03.2023 |
| 1/8-finals | Batyutenko M./Khairutdinov A. | Kawachi K./Okamura I. | 1:2 (6:4, 2:6, 5:10) | details | 08.03.2023 |
Kazakhstan: M15 Aktobe - Doubles - Main |
| Semi-finals | Kawachi K./Okamura I. | Liaonenka A./Zgirovsky A. | 0:2 (4:6, 4:6) | details | 03.03.2023 |
| Quarter-finals | Kawachi K./Okamura I. | Catini N./Noce G. M. | 2:0 (7:5, 6:1) | details | 02.03.2023 |
| 1/8-finals | Arutiunian E./Lomakin G. | Kawachi K./Okamura I. | 0:2 (61:7, 3:6) | details | 01.03.2023 |