| ITF Japan F6 Qual | 05/29 04:00 | 54 | Watanuki, Keisuke v 시마부쿠로, 소 | 6-1,6-0 | |
| ITF Japan F6 Qual | 05/28 01:00 | 54 | Watanuki, Keisuke v Yoshida, Shin | 6-1,6-4 | |
| ITF Japan F5 | 04/06 03:40 | 25 | Watanuki, Keisuke v 카타야마, 쇼 | 2-6,5-7 | |
| ITF Japan F4 | 03/29 05:10 | 25 | Watanuki, Keisuke v 이마이, 신타로 | 3-6,6-3,1-6 | |
| ITF Japan F4 | 03/28 01:00 | 62 | 키쿠치, 겐고 v Watanuki, Keisuke | 2-6,7-5,6-7 | |
| ITF Japan F4 | 03/27 01:00 | 62 | 타카하시, 유스케 v Watanuki, Keisuke | 4-6,3-6 | |
| ITF Japan F3 | 03/22 03:10 | 25 | 오니시, 켄 v Watanuki, Keisuke | 2-6,6-2,7-5 | |
| ITF Japan F3 | 03/20 02:30 | 44 | Shiga, Masato v Watanuki, Keisuke | 4-6,6-2,3-6 | |
| ITF Japan F3 | 03/19 03:45 | 44 | 테, 리겔 v Watanuki, Keisuke | 2-6,1-6 | |
| ITF Japan F2 | 03/15 04:30 | 25 | Watanuki, Keisuke v Kibi, Yuya | 2-6,6-4,1-6 | |
| ITF Japan F2 | 03/13 01:00 | 54 | 왕, 아우란 v Watanuki, Keisuke | 0-6,4-6 | |
| ITF Japan F2 | 03/12 00:30 | 54 | Numajiri, Keisuke v Watanuki, Keisuke | 6-2,2-6,1-6 | |
| ITF Japan F1 | 03/10 02:35 | 25 | 니키, 타쿠토 v Watanuki, Keisuke | 7-5,6-2 | |
| ITF Japan F1 | 03/07 01:00 | 62 | Watanuki, Keisuke v 카와치, 카즈마 | 6-1,6-1 | |
| ITF Japan F1 | 03/06 03:00 | 62 | Watanuki, Keisuke v 푸쿠다, 소라 | 6-1,3-6,6-3 | |
| ITF Japan F1 | 03/05 03:00 | 62 | Watanuki, Keisuke v 이누이, 유이치로 | 6-2,6-3 | |
| ITF Japan F8 | 06/26 05:05 | - | Nagao, Katsuki v Watanuki, Keisuke | Retired | |
| ITF Japan F8 | 06/25 01:00 | - | Numajiri, Keisuke v Watanuki, Keisuke | 3-6,3-6 | |
| ITF Japan F8 | 06/24 02:45 | - | Watanuki, Keisuke v 이토, 유이치 | 6-1,7-5 | |
| ITF Japan F7 | 06/16 02:15 | - | Onozawa, Arata v Watanuki, Keisuke | 7-6,0-6,6-3 | |
| ITF Japan F6 | 06/11 02:55 | - | 니키, 타쿠토 v Watanuki, Keisuke | 6-7,7-6,6-4 | |
| ITF Japan F6 | 06/10 01:30 | - | Watanuki, Keisuke v Oku, Hiromasa | 6-2,6-3 | |
| ITF Japan F5 | 06/04 02:00 | - | 판쿠트, 토마스 v Watanuki, Keisuke | 7-5,7-6 | |
| ITF Japan F5 | 06/03 06:30 | - | 마츠무라, 리오타로 v Watanuki, Keisuke | 6-2,4-6,0-6 | |
| ITF Greece F9 | 04/29 10:05 | - | Simunek, David v Watanuki, Keisuke | 6-4,6-2 | |
| ITF Greece F5 | 04/23 07:00 | - | 코체발-데스만, 톰 v Watanuki, Keisuke | 6-3,6-2 | |
| ITF Greece F5 | 04/21 10:40 | - | Kapogiannis, Charalampos v Watanuki, Keisuke | 6-3,1-6,5-7 | |
| ITF Greece F4 | 04/12 11:00 | - | Watanuki, Keisuke v Frljanic, Stefan | 6-4,2-6,5-7 | |
| ITF Japan F3 | 03/21 02:30 | - | 오카무라, 이세이 v Watanuki, Keisuke | 6-2,6-3 | |
| ITF Japan F2 | 03/14 00:30 | - | 모리타니, 소이치로 v Watanuki, Keisuke | 6-4,6-2 |