| ITF Japan F7 | 2015/06/16 00:30 | Ko Suzuki v Watanuki, Yusuke | 0-6,2-6 |
| ITF Japan F7 | 2015/06/16 00:30 | Ko Suzuki v Watanuki, Yusuke | 0-6,2-6 |
| 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 F7 | 2015/06/21 02:00 | Ehara, Hiroyasu v Watanuki, Yusuke | 7-5,4-6,2-6 |
| ITF Japan F7 | 2015/06/20 01:00 | Watanuki, Yusuke v Moon, Ju-Hae | 6-2,7-6 |
| ITF Japan F7 | 2015/06/19 03:00 | Oku, Hiromasa v Watanuki, Yusuke | 2-6,3-6 |
| ITF Japan F7 | 2015/06/18 00:30 | Habusawa, Tetsuro v Watanuki, Yusuke | 4-6,2-6 |
| ITF Japan F7 | 2015/06/16 00:30 | Ko Suzuki v Watanuki, Yusuke | 0-6,2-6 |
| 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 |