Round: 25 Ground: Hardcourt outdoor
| ITF Japan F3 | 2017/03/20 04:00 | Jeamoon Lee v Yosuke Watanuki | 6-3,2-6,6-0 |
| Challenger Yokohama | 2017/02/28 01:00 | Yosuke Watanuki v Ze Zhang | 3-6,0-6 |
| Challenger Kyoto | 2017/02/24 06:00 | Yosuke Watanuki v Blaz Kavcic | 4-6,6-2,4-6 |
| Challenger Kyoto | 2017/02/22 08:10 | Ruben Bemelmans v Yosuke Watanuki | 6-1,4-6,6-7 |
| Challenger Kyoto | 2017/02/20 06:25 | Joris De Loore v Yosuke Watanuki | 4-6,6-3,6-7 |
| Challenger Toyota | 2016/11/16 02:15 | Tatsuma Ito v Yosuke Watanuki | 6-4,6-4 |
| Challenger Toyota | 2016/11/15 01:00 | Yosuke Watanuki v Ante Pavic | 6-3,6-3 |
| Challenger Kobe | 2016/11/10 02:00 | Yosuke Watanuki v Duckhee Lee | 1-6,2-6 |
| ITF Spain F4 | 2017/02/06 08:30 | Marc Fornell-Mestres v Adria Mas Mascolo | 5-7,2-6 |
| ITF Spain F4 | 2017/02/05 08:30 | Marc Fornell-Mestres v Dietrich Dernowski | 6-2,6-1 |
| ITF Spain F4 | 2017/02/04 11:30 | Marc Fornell-Mestres v Leo Julien Sebaoun | 6-2,6-1 |
| ITF Spain F2 | 2017/01/25 12:40 | Marc Fornell-Mestres v Billy Harris | 2-6,5-7 |
| ITF Spain F2 | 2017/01/24 09:00 | Marc Fornell-Mestres v Barney Fitzpatrick | 6-0,6-2 |
| ITF Spain F2 | 2017/01/24 08:30 | Marc Fornell-Mestres v Patrick Mayer | 6-4,6-2 |
| ITF Spain F1 | 2017/01/16 12:00 | Pedro Martinez v Marc Fornell-Mestres | 3-6,6-3,6-3 |
| ITF Spain F39 | 2016/12/01 09:00 | Marc Fornell-Mestres v Pablo Vivero Gonzalez | 7-5,6-7,2-6 |