| ITF M15 Karuizawa | 05/28 01:00 | 25 | Yohan Sung v Goran Markovic | 4-6,2-6 | |
| ITF M15 Kashiwa | 04/02 04:30 | 25 | Cheong-Eui Kim v Yo Han Sung | 6-1,6-0 | |
| Challenger Yokohama | 02/25 07:10 | 24 | Andrew Harris v Yo Han Sung | 6-1,6-2 | |
| ITF Japan F1 | 03/04 01:00 | 62 | Yo Han Sung v Masamichi Imamura | 0-6,0-6 | |
| Challenger Yokohama Qual | 02/24 06:15 | 45 | Yuta Shimizu v Yohan Sung | 6-2,6-3 |