Round: 27 Ground: Hardcourt outdoor
| ITF Korea F1 | 2017/06/01 02:00 | Ju-Hae Moon v Chan-Yeong Oh | 3-6,2-6 |
| ITF Korea F1 | 2017/05/31 06:40 | Chan-Yeong Oh v Woo Hyeok Jang | 6-2,4-6,6-1 |
| Challenger Busan | 2017/05/15 08:00 | Chan-Yeong Oh v Sadio Doumbia | 6-2,2-6,2-6 |
| Challenger Seoul Qual | 2017/05/07 01:30 | Chan-Yeong Oh v Luke Saville | 2-6,4-6 |
| Challenger Seoul Qual | 2017/05/06 01:00 | Chan-Yeong Oh v Hyeong Jin Cho | 6-1,6-2 |
| Challenger Gimcheon Qual | 2017/04/30 02:50 | Chan-Yeong Oh v Hubert Hurkacz | 0-6,3-6 |
| Challenger Gimcheon Qual | 2017/04/29 03:50 | Hangyeom Kim v Chan-Yeong Oh | 2-6,3-6 |
| ITF Japan F5 | 2017/04/05 02:50 | Chan-Yeong Oh v Takuto Niki | 4-6,6-3,2-6 |
| ITF Korea F1 | 2017/06/01 02:55 | Tae-Woo Lee v Makoto Ochi | 4-6,7-5,1-6 |
| ITF Korea F1 | 2017/05/30 02:40 | Byeonghun Kim v Makoto Ochi | 2-6,0-6 |
| Challenger Seoul Qual | 2017/05/07 04:20 | Makoto Ochi v Shuichi Sekiguchi | 1-6,1-6 |
| Challenger Seoul Qual | 2017/05/06 05:05 | Cheong-Eui Kim v Makoto Ochi | 6-2,3-6,1-6 |
| Challenger Gimcheon Qual | 2017/05/01 02:00 | Bradley Mousley v Makoto Ochi | 6-3,6-2 |
| Challenger Gimcheon Qual | 2017/04/30 01:00 | Nam Hoang Ly v Makoto Ochi | 4-6,6-4,3-6 |
| Challenger Gimcheon Qual | 2017/04/29 01:00 | Makoto Ochi v Yusuke Takahashi | 6-1,6-3 |
| ITF Portugal F6 | 2017/04/12 09:30 | Makoto Ochi v Goncalo Oliveira | 5-7,4-6 |