Select tournament type
| 1/16-finals | Purcell M. | Koyama H. | 2:0 (6:2, 6:1) | details | 17.06.2026 | ||
| 1/16-finals | Koyama H. | Jones H. | 0:2 (4:6, 64:7) | details | 10.06.2026 | ||
| Semi-finals | Kadiri Hassani Y. | Koyama H. | 2:1 (6:4, 64:7, 6:4) | details | 06.06.2026 | ||
| Quarter-finals | Koyama H. | Sinclair C. | 2:0 (7:66, 7:63) | details | 05.06.2026 | ||
| 1/8-finals | Roh H. | Koyama H. | 0:2 (65:7, 2:6) | details | 04.06.2026 | ||
| 1/16-finals | Koyama H. | Arcon A. | 2:0 (6:4, 6:2) | details | 03.06.2026 | ||
| Semi-finals | Koyama H. | Delaney Ja. | 0:2 (3:6, 1:6) | details | 30.05.2026 | ||
| Quarter-finals | Shiraishi H. | Koyama H. | 1:2 (6:7, 6:2, 3:6) | details | 29.05.2026 | ||
| 1/8-finals | Koyama H. | Koizumi N. | 2:0 (6:4, 6:4) | details | 28.05.2026 | ||
| 1/16-finals | Tanuma R. | Koyama H. | 1:2 (1:6, 6:4, 63:7) | details | 27.05.2026 | ||
| 1/8-finals | Sahtali T. | Koyama H. | 2:0 (7:65, 6:2) | details | 16.04.2026 | ||
| 1/16-finals | Koyama H. | Abibsi A. | 2:0 (6:3, 6:2) | details | 15.04.2026 | ||
| 1/16-finals | Nijboer R. | Koyama H. | 2:0 (6:3, 6:2) | details | 18.03.2026 | ||
| 1/16-finals | Palan D. | Koyama H. | 2:0 (7:5, 6:1) | details | 04.03.2026 | ||
| 1/16-finals | Koyama H. | Heredia S. | 0:2 (2:6, 3:6) | details | 25.02.2026 | ||
| 1/8-finals | Jianu F. C. | Koyama H. | 2:0 (6:1, 6:2) | details | 26.12.2025 | ||
| 1/16-finals | Koyama H. | Jovic N. | 2:0 (6:2, 6:3) | details | 25.12.2025 | ||
| Quarter-finals | Baris O. | Koyama H. | 2:0 (6:1, 6:2) | details | 19.12.2025 | ||
| 1/8-finals | Madaras N. | Koyama H. | 0:2 (4:6, 2:6) | details | 18.12.2025 | ||
| 1/16-finals | Koyama H. | Dinev D. | 2:1 (6:3, 3:6, 6:4) | details | 17.12.2025 | ||
| 1/16-finals | Koyama H. | Madaras N. | 0:2 (3:6, 4:6) | details | 03.12.2025 | ||
| 1/16-finals | Koyama H. | Karigyo T. | 1:2 (6:3, 5:7, 1:6) | details | 22.10.2025 | ||
| 1/16-finals | Kusuhara Y. | Koyama H. | 2:1 (2:6, 7:5, 6:3) | details | 10.09.2025 | ||
| 1/16-finals | Koyama H. | Hazawa S. | 1:2 (6:3, 1:6, 4:6) | details | 02.09.2025 | ||
| Semi-finals | Koyama H./Suzuki K. | Delaney Je./Sach T. | 0:2 (5:7, 5:7) | details | 05.06.2026 | ||
| Quarter-finals | Koyama H./Suzuki K. | Alcantara F. C./Sinclair C. | 2:1 (1:6, 7:5, 10:4) | details | 04.06.2026 | ||
| 1/8-finals | Kleiman M./Voelzke G. | Koyama H./Suzuki K. | 1:2 (6:4, 4:6, 7:10) | details | 02.06.2026 | ||
| 1/8-finals | Fukuda S./Masabayashi T. | Koyama H./Suzuki K. | 2:0 (6:2, 7:65) | details | 26.05.2026 | ||
| 1/8-finals | Koyama H./Nagoudi A. | Gil Garcia A./Papagno S. | 1:2 (65:7, 6:1, 6:10) | details | 22.04.2026 | ||
| Semi-finals | Jiang F./Koyama H. | Tabacco F./Tabacco G. | 0:2 (6:7, 2:6) | details | 17.04.2026 | ||
| Quarter-finals | Demanet E./Tepmahc N. | Jiang F./Koyama H. | 0:2 (5:7, 2:6) | details | 17.04.2026 | ||
| 1/8-finals | Jiang F./Koyama H. | De Carvalho V./Massard L. | 2:0 (6:2, 6:2) | details | 16.04.2026 | ||
| Quarter-finals | Beauge M./De Carvalho V. | Ciocca G./Koyama H. | 2:0 (6:3, 6:2) | details | 09.04.2026 | ||
| 1/8-finals | Nagoudi A./Sousou C. | Ciocca G./Koyama H. | 0:2 (2:6, 4:6) | details | 07.04.2026 | ||
| Quarter-finals | Ivarsson J./Koyama H. | Eichenseher D./Gschwendtner J. | 0:2 (3:6, 1:6) | details | 04.03.2026 | ||
| 1/8-finals | Ivarsson J./Koyama H. | Bianchi J./Munoz Fuster J. | 2:0 (7:5, 6:4) | details | 03.03.2026 | ||
| 1/8-finals | Ivarsson J./Koyama H. | Burdet A./Gutierrez O. J. | 0:2 (3:6, 3:6) | details | 25.02.2026 | ||
| 1/8-finals | Koyama H./Leather J. | Heredia S./Linde Palacios S. A. | 0:2 (4:6, 3:6) | details | 18.02.2026 | ||
| Final | Al Azmeh T./Baris O. | Koyama H./Muto S. | 2:0 (6:4, 7:61) | details | 27.12.2025 | ||
| Semi-finals | Marinescu M. R./Ovcharenko O. | Koyama H./Muto S. | 0:2 (4:6, 3:6) | details | 27.12.2025 | ||
| Quarter-finals | Koyama H./Muto S. | Ivarsson J./Yazdani A. | 2:0 (7:66, 6:1) | details | 26.12.2025 | ||
| 1/8-finals | Cizek J./Jovic N. | Koyama H./Muto S. | 1:2 (6:4, 61:7, 2:10) | details | 26.12.2025 | ||
| Semi-finals | Koyama H./Suzuki K. | Ichikawa T./Sueoka Y. | 0:2 (2:6, 3:6) | details | 24.10.2025 | ||
| Quarter-finals | Koyama H./Suzuki K. | Cho Seung Woo/Kim D. J. | 2:1 (5:7, 6:4, 10:6) | details | 23.10.2025 | ||
| 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 | Adachi T./Koyama H. | Oki Y./Vithoontien L. | 0:2 (2:6, 2:6) | details | 16.09.2025 | ||
| Quarter-finals | Koyama H./Takahashi Y. | Kusuhara Y./Nakagawa S. | 0:2 (3:6, 4:6) | details | 04.09.2025 | ||
| 1/8-finals | Koyama H./Takahashi Y. | Matsumura R./Tomida Y. | 2:0 (6:4, 6:4) | details | 03.09.2025 | ||
| Quarter-finals | Koyama H./Oki Y. | Fukuda S./Kono Y. | 1:2 (6:4, 4:6, 6:10) | details | 07.08.2025 | ||
| 1/8-finals | Ogura K./Saitoh K. | Koyama H./Oki Y. | 1:2 (4:6, 6:2, 8:10) | details | 05.08.2025 | ||