Ground: Synthetic outdoor
| ITF Japan F6 | 2015/06/11 01:00 | Ko Suzuki v Takeuchi, Kento (1987) | 6-7,3-6 |
| ITF Japan F6 Qual | 2015/06/07 01:00 | Ko Suzuki v Tanaka-Tamaki, Kento | 6-2,6-3 |
| ITF Guam F1 | 2015/05/30 04:20 | Kikuchi, Gengo v Ko Suzuki | 6-2,6-3 |
| ITF Guam F1 | 2015/05/29 05:10 | Ko Suzuki v Katayama, Sho | 6-3,4-6,6-2 |
| ITF Guam F1 | 2015/05/28 00:00 | Sano, Koichi v Ko Suzuki | 2-6,1-6 |
| ITF Japan F3 | 2015/03/23 01:00 | Ko Suzuki v Jeamoon Lee | 3-6,0-6 |
| ITF Japan F3 | 2015/03/21 04:00 | Ko Suzuki v Ryotaro Matsumura | 6-0,6-1 |
| ITF Japan F2 | 2015/03/17 05:25 | Ko Suzuki v Moritani, Soichiro | 6-3,3-6,2-6 |
| ITF Japan F6 | 2015/06/11 01:00 | Watanuki, Yusuke v Saito, Takashi | 6-3,6-7,3-6 |
| ITF Japan F6 | 2015/06/09 04:00 | Watanuki, Yusuke v Renta Tokuda | 7-5,2-6,6-2 |
| ITF Japan F4 | 2015/04/02 01:00 | Ehara, Hiroyasu v Watanuki, Yusuke | 6-3,2-6,6-2 |
| ITF Japan F4 | 2015/04/01 01:00 | Jumpei Yamasaki v Watanuki, Yusuke | 6-7,3-6 |
| ITF Japan F4 | 2015/03/31 01:00 | Akira Santillan v Watanuki, Yusuke | 4-6,6-0,5-7 |
| ITF Japan F3 | 2015/03/24 02:10 | Watanuki, Yusuke v Sekiguchi, Shuichi | 1-6,3-6 |
| ITF Tunisia F5 | 2015/02/05 10:20 | Watanuki, Yusuke v Tepavac, Marko | 3-6,0-6 |
| ITF Tunisia F5 | 2015/02/03 08:30 | Watanuki, Yusuke v Licciardi, Pietro | 6-3,6-7,6-2 |