Stadium: Center Court Round: 54
| Challenger Gwangju Qual | 2018/08/12 01:30 | Shintaro Imai v Jung-Woong Na | 4-6,2-6 |
| Challenger Gwangju Qual | 2018/08/11 01:30 | Issei Okamura v Jung-Woong Na | 3-6,6-1,1-6 |
| ITF Korea F1 | 2018/06/06 01:00 | Jung-Woong Na v Ji Hoon Son | 6-4,6-7,6-4 |
| Challenger Busan | 2018/05/15 05:50 | Max Purcell v Jung-Woong Na | 6-4,6-1 |
| Challenger Gimcheon Qual | 2018/05/05 05:20 | Jacob Grills v Jung-Woong Na | 5-7,6-4,6-3 |
| Challenger Seoul Qual | 2018/04/29 02:00 | Jung-Woong Na v Makoto Ochi | 2-6,4-6 |
| Challenger Seoul Qual | 2018/04/28 03:05 | Jung-Woong Na v Tae-Woo Lee | 6-1,6-3 |
| ITF Turkey F5 | 2018/02/08 07:30 | Jung-Woong Na v Nino Serdarusic | 1-6,2-6 |
| Challenger Gwangju Qual | 2018/08/12 01:30 | Yecong He v Jumpei Yamasaki | 6-2,6-4 |
| Challenger Gwangju Qual | 2018/08/11 01:30 | Yecong He v Chan-Yeong Oh | 7-6,6-0 |
| Challenger Jinan | 2018/08/07 02:00 | James Ward v Yecong He | 2-6,7-5,6-1 |
| Challenger Bastad Qual | 2018/07/07 11:05 | Lucas Renard v Yecong He | 4-6,6-3,6-4 |
| Challenger Recanati Qual | 2018/06/30 08:00 | Jurij Rodionov v Yecong He | 7-6,6-3 |
| ITF China F7 | 2018/06/02 03:25 | Di Wu v Yecong He | 6-0,6-1 |
| ITF China F7 | 2018/06/01 05:10 | Yecong He v Kento Takeuchi | 6-2,6-2 |
| ITF China F7 | 2018/05/31 04:30 | Hiroyasu Ehara v Yecong He | 6-4,4-6,1-6 |