Round: 26 Ground: Clay
| ITF Japan F5 | 2016/04/06 03:40 | Keisuke Watanuki v Sho Katayama | 2-6,5-7 |
| ITF Japan F6 | 2014/06/11 07:50 | Sho Katayama v Keisuke Watanuki | 6-3,7-5 |
| ITF Japan F8 | 2016/06/15 04:30 | Shunrou Takeshima v Keisuke Watanuki | 6-7,0-6 |
| ITF Japan F7 | 2016/06/09 02:30 | Chan-Yeong Oh v Keisuke Watanuki | 6-3,6-7,6-4 |
| ITF Japan F7 | 2016/06/07 01:00 | Keisuke Watanuki v Takuto Niki | 6-4,7-6 |
| ITF Japan F6 | 2016/05/31 05:25 | Yusuke Takahashi v Keisuke Watanuki | 6-3,6-4 |
| ITF Japan F6 Qual | 2016/05/29 04:00 | Keisuke Watanuki v Sho Shimabukuro | 6-1,6-0 |
| ITF Japan F6 Qual | 2016/05/28 01:00 | Keisuke Watanuki v Shin Yoshida | 6-1,6-4 |
| ITF Japan F5 | 2016/04/06 03:40 | Keisuke Watanuki v Sho Katayama | 2-6,5-7 |
| ITF Japan F4 | 2016/03/29 05:10 | Keisuke Watanuki v Shintaro Imai | 3-6,6-3,1-6 |
| ITF Japan F8 | 2016/06/15 04:30 | Ryota Tanuma v Sho Katayama | 3-6,1-6 |
| ITF Japan F7 | 2016/06/12 05:20 | Sho Katayama v Evan King | 2-6,6-7 |
| ITF Japan F7 | 2016/06/11 03:40 | Yusuke Takahashi v Sho Katayama | 2-6,0-6 |
| ITF Japan F7 | 2016/06/10 01:00 | Masato Shiga v Sho Katayama | 3-6,3-6 |
| ITF Japan F7 | 2016/06/09 02:00 | Koichi Sano v Sho Katayama | 6-3,2-6,1-6 |
| ITF Japan F7 | 2016/06/07 03:40 | Hiromasa Oku v Sho Katayama | 1-6,2-6 |
| ITF Japan F6 | 2016/06/01 01:00 | Sho Katayama v Yasutaka Uchiyama | 4-6,3-6 |
| ITF Japan F6 | 2016/05/31 01:00 | Sho Katayama v Katsuki Nagao | 3-6,6-4,6-3 |