Stadium: Court 4 Round: 24 Ground: Hardcourt outdoor
| Challenger Yokohama Qual | 2018/02/25 02:35 | Yunseong Chung v Takuto Niki | 6-7,6-3,6-3 |
| Challenger Kyoto Qual | 2017/02/18 05:25 | Yunseong Chung v Takuto Niki | 2-6,6-7 |
| ITF Japan F2 | 2016/03/15 02:25 | Takuto Niki v Yunseong Chung | 3-6,6-3,3-6 |
| Challenger Ningbo | 2019/10/16 03:35 | Yunseong Chung v Danilo Petrovic | 3-6,3-6 |
| Challenger Ningbo | 2019/10/15 02:00 | Yunseong Chung v Aoran Wang | 1-6,6-2,6-1 |
| Challenger Kaohsiung | 2019/09/17 01:30 | Yunseong Chung v Miliaan Niesten | 4-6,3-6 |
| Challenger Jinan | 2019/09/02 02:00 | Yunseong Chung v Kaichi Uchida | 2-6,4-6 |
| US Open | 2019/08/20 16:20 | Salvatore Caruso v Yunseong Chung | 6-0,6-2 |
| Challenger Yokkaichi | 2019/08/08 02:00 | Yunseong Chung v Saketh Myneni | 3-6,6-3,3-6 |
| Challenger Yokkaichi | 2019/08/06 07:20 | Yunseong Chung v Alafia Ayeni | 7-6,6-3 |
| Challenger Chengdu | 2019/07/31 04:55 | Yunseong Chung v Dayne Kelly | 3-6,6-4,2-6 |
| ITF M15 Changwon | 2019/10/16 04:50 | Ryohei Tagata v Takuto Niki | 7-5,2-6,6-4 |
| ITF M15 Fayetteville | 2019/09/20 19:30 | Takuto Niki v Oscar Mesquida Berg | 7-6,3-6,6-4 |
| ITF M15 Fayetteville | 2019/09/19 14:00 | Takuto Niki v Eduardo Nava | 7-5,7-5 |
| ITF M15 Fayetteville | 2019/09/18 14:00 | Takuto Niki v Ryan Goetz | 7-5,6-4 |
| ITF M15 Champaign | 2019/09/11 16:00 | Takuto Niki v Matheus Pucinelli De Almeida | 1-6,5-7 |
| ITF M15 Sajur | 2019/09/05 07:50 | Yair Sarouk v Takuto Niki | 7-5,6-3 |
| ITF M15 Sajur | 2019/09/04 12:35 | Ran Amar v Takuto Niki | 0-6,3-6 |
| ITF M15 Kiryat Shmona | 2019/08/30 07:00 | Takuto Niki v Riccardo Maiga | 6-7,6-2,3-6 |