| ITF Guam F1 | 2014/05/30 02:15 | Jun, Woong-Sun v Niki, Takuto | 4-6,6-7 |
| ITF Korea F1 | 2014/04/23 01:00 | Niki, Takuto v Jun, Woong-Sun | 6-1,6-4 |
| ITF Hong Kong F2 | 2015/06/16 05:00 | Jun, Woong-Sun v Giraldi Requena, Marcos | 2-6,3-6 |
| ITF Hong Kong F1 | 2015/06/09 03:45 | Yu, Cheng-Yu v Jun, Woong-Sun | 6-4,6-1 |
| ITF Japan F6 | 2014/06/13 00:00 | Jun, Woong-Sun v Takeshima, Shunrou | 7-6,1-6,4-6 |
| ITF Japan F6 | 2014/06/10 06:05 | Kondo, Hiroki v Jun, Woong-Sun | 3-6,4-6 |
| ITF Guam F1 | 2014/05/30 02:15 | Jun, Woong-Sun v Niki, Takuto | 4-6,6-7 |
| ITF Korea F1 | 2014/04/23 01:00 | Niki, Takuto v Jun, Woong-Sun | 6-1,6-4 |
| ITF Korea F1 Qual | 2014/04/21 03:50 | Jun, Woong-Sun v Jae Hwan Kim | 3-6,6-1,7-6 |
| ITF Japan F4 | 2014/04/02 04:45 | Kibi, Yuya v Jun, Woong-Sun | 6-2,6-7,6-2 |
| ITF Japan F6 | 2015/06/13 01:30 | Niki, Takuto v Toshihide Matsui | 3-6,2-6 |
| ITF Japan F6 | 2015/06/12 05:30 | Niki, Takuto v Sasai, Masaki | 6-2,6-1 |
| ITF Japan F6 | 2015/06/11 02:55 | Niki, Takuto v Watanuki, Keisuke | 6-7,7-6,6-4 |
| ITF China F6 | 2015/05/28 02:00 | Gao, Xin v Niki, Takuto | 6-2,7-6 |
| ITF China F6 | 2015/05/26 07:25 | Gong, Xiao v Niki, Takuto | 2-6,2-6 |
| ITF Japan F4 | 2015/04/04 01:30 | Yasutaka Uchiyama v Niki, Takuto | 6-1,6-2 |
| ITF Japan F4 | 2015/04/03 01:30 | Zhe Li v Niki, Takuto | 2-6,2-6 |
| ITF Japan F4 | 2015/04/02 03:15 | Lim, Yong-Kyu v Niki, Takuto | 2-6,2-6 |