| Challenger Toyota | 11/14 01:00 | 25 | Tatsuma Ito v Yusuke Watanuki | 7-6,6-2 | |
| ITF M25 Maribor Qual | 11/06 05:20 | 46 | Cheong-Eui Kim v Yusuke Watanuki | 6-3,7-6 | |
| ITF M25 Maribor Qual | 11/05 07:05 | 45 | Yusuke Watanuki v Tung-Lin Wu | 7-6,6-4 | |
| ITF Australia F8 | 10/14 02:00 | 27 | Blake Mott v Yusuke Watanuki | 6-1,6-3 | |
| ITF Australia F8 | 10/13 02:25 | 26 | Yusuke Watanuki v Luke Saville | 6-2,6-1 | |
| ITF Australia F8 | 10/12 02:10 | 25 | Yusuke Watanuki v Ivan Goluza | 6-3,6-3 | |
| ITF Australia F7 | 10/05 00:00 | 25 | Jarmere Jenkins v Yusuke Watanuki | 7-5,7-6 | |
| Challenger Nanchang Qual | 09/11 04:55 | 54 | Denys Molchanov v Yusuke Watanuki | 6-3,6-4 | |
| Challenger Nanchang Qual | 09/10 05:20 | 46 | Yuqing Ning v Yusuke Watanuki | 3-6,4-6 | |
| ITF Spain F26 | 08/17 16:25 | 26 | Aitor S Llopis v Yusuke Watanuki | 6-2,6-4 | |
| ITF Spain F26 | 08/15 14:00 | 25 | Luis F Labarta v Yusuke Watanuki | 0-6,2-6 | |
| ITF Spain F25 | 08/11 09:30 | 27 | Viktor Durasovic v Yusuke Watanuki | 6-3,6-3 | |
| ITF Spain F25 | 08/10 10:50 | 26 | Oscar M Cornella v Yusuke Watanuki | 1-6,0-6 | |
| ITF Spain F24 | 08/04 09:00 | 26 | Yannick Mertens v Yusuke Watanuki | 6-4,6-4 | |
| ITF Spain F24 | 08/02 18:30 | 25 | Yusuke Watanuki v Manuel Montalvo Hidalgo | 6-4,6-1 | |
| ITF Japan F8 | 06/19 02:00 | 29 | Gengo Kikuchi v Yusuke Watanuki | 4-6,7-6,6-0 | |
| ITF Japan F8 | 06/18 03:15 | 28 | Yusuke Watanuki v Renta Tokuda | 7-5,6-2 | |
| ITF Japan F8 | 06/17 03:40 | 27 | Sho Shimabukuro v Yusuke Watanuki | 6-7,1-6 | |
| ITF Japan F8 | 06/16 03:20 | 26 | Yuta Shimizu v Yusuke Watanuki | 3-6,6-3,4-6 | |
| ITF Japan F7 | 06/10 01:00 | 27 | Yusuke Watanuki v Evan King | 5-7,4-6 | |
| ITF Japan F7 | 06/09 01:00 | 26 | Yusuke Watanuki v Ryota Tanuma | 6-0,6-2 | |
| ITF Japan F7 | 06/06 04:40 | 25 | Yusuke Watanuki v Shunrou Takeshima | 7-5,6-4 | |
| ITF Japan F5 | 04/06 04:15 | 25 | Masato Shiga v Yusuke Watanuki | 7-6,6-4 | |
| ITF Japan F1 | 03/10 06:50 | 26 | Gengo Kikuchi v Yusuke Watanuki | Retired | |
| ITF Japan F1 | 03/10 02:45 | 25 | Katsuki Nagao v Yusuke Watanuki | 1-6,6-2,1-6 | |
| ITF Turkey F5 | 02/03 08:00 | 25 | Germain Gigounon v Yusuke Watanuki | 6-1,4-6,6-4 | |
| ITF Turkey F4 | 01/26 11:05 | 25 | Yusuke Watanuki v Tallon Griekspoor | 3-6,1-6 | |
| ITF Turkey F3 | 01/22 13:40 | 27 | Joris De Loore v Yusuke Watanuki | 6-3,6-0 | |
| ITF Turkey F3 | 01/22 09:00 | 26 | Altug Celikbilek v Yusuke Watanuki | 3-6,6-7 | |
| ITF Turkey F3 | 01/19 08:00 | 25 | Hannes Wagner v Yusuke Watanuki | 5-7,1-6 |