Stadium: Court 3 Round: 25
| ITF Korea F6 | 2018/08/26 02:00 | Mu Fu Tsai v Geun Jun Kim | 0-6,1-6 |
| ITF Korea F5 | 2018/08/18 01:00 | Hyeon il Jung v Geun Jun Kim | 7-6,1-6,4-6 |
| ITF Korea F4 | 2018/08/15 01:00 | Ju-Hae Moon v Geun Jun Kim | 6-2,6-3 |
| ITF Korea F4 | 2018/08/14 01:00 | Ki Su Jung v Geun Jun Kim | 2-6,1-6 |
| ITF Korea F3 | 2018/06/19 09:45 | Geun Jun Kim v Chukang Wang | 4-6,1-6 |
| ITF Korea F3 Qual | 2018/06/18 01:00 | Young-Hoon Jeong v Geun Jun Kim | 4-6,4-6 |
| ITF Korea F3 Qual | 2018/06/17 03:00 | Geun Jun Kim v Dae-Hee Lee | 7-5,7-5 |
| ITF Korea F3 Qual | 2018/06/16 03:30 | Jaeyoung Park v Geun Jun Kim | 1-6,0-6 |
| ITF Korea F5 | 2018/08/18 02:00 | Dong-Hak Sin v Sung Hun Kim | 5-7,1-6 |
| Challenger Gwangju | 2018/08/14 09:20 | Dong-Hak Sin v Maverick Banes | 2-6,1-6 |
| ITF Korea F2 | 2018/06/10 06:30 | Jin Sung Han v Dong-Hak Sin | 7-6,4-6,7-6 |
| ITF Korea F1 | 2018/06/07 01:00 | Cheong-Eui Kim v Dong-Hak Sin | 6-1,6-2 |
| ITF Korea F1 | 2018/06/05 03:50 | Dong-Hak Sin v Ju-Hae Moon | 6-1,6-4 |
| ITF Korea F1 | 2018/06/04 01:00 | Dong-Hak Sin v Jun Sang Park | 6-2,6-3 |
| ITF Korea F1 | 2018/06/03 02:00 | Dong-Hak Sin v Woo Hyeok Jang | 6-1,6-2 |
| Challenger Gwangju | 2017/09/19 01:30 | Dong-Hak Sin v Matthew Ebden | 5-7,3-6 |