| Wimbledon | 06/28 12:45 | 15 | Hyeon Chung v Enzo Couacaud | Retired | |
| Wimbledon | 06/26 14:00 | 14 | Dimitar Kuzmanov v Hyeon Chung | 2-6,6-3,3-6 | |
| Challenger Ilkley | 06/17 10:00 | 14 | Hyeon Chung v Jesper De Jong | Retired | |
| Challenger Nottingham | 06/13 13:55 | 25 | Nuno Borges v Hyeon Chung | 6-3,6-2 | |
| Challenger Surbiton | 06/05 12:40 | 25 | Hyeon Chung v Andy Murray | 3-6,2-6 | |
| Challenger Busan | 05/09 03:30 | 25 | Hyeon Chung v Yasutaka Uchiyama | 3-6,7-6,2-6 | |
| Challenger Seoul | 04/26 03:20 | 25 | Hyeon Chung v Jordan Thompson | 2-6,4-6 | |
| French Open | 09/23 14:50 | 15 | [149] Hyeon Chung v Renzo Olivo [208] | 6-7,2-6 | |
| French Open | 09/22 09:55 | 14 | [344] Baptiste Crepatte v Hyeon Chung [148] | 6-7,4-6 | |
| Challenger Prostejov | 09/07 14:20 | 25 | [123] Jozef Kovalik v Hyeon Chung [144] | 7-6,6-2 | |
| Challenger Ostrava | 09/02 10:30 | 25 | [167] Lukas Rosol v Hyeon Chung [144] | 2-6,6-4,6-0 | |
| Challenger Praga 2 | 08/25 10:00 | 25 | [224] Zdenek Kolar v Hyeon Chung [142] | 6-3,6-1 | |
| Challenger Indian Wells | 03/02 19:10 | 24 | [185] Thai-Son Kwiatkowski v Hyeon Chung [142] | 7-6,6-2 | |
| Australian Open | 01/15 05:55 | 44 | Lorenzo Musetti v Hyeon Chung | Cancelled | |
| Challenger Canberra | 01/07 00:50 | 24 | Akira Santillan v Hyeon Chung | Cancelled | |
| Mubadala World Tennis Championship | 12/20 11:00 | 29 | [23] Andrey Rublev v Hyeon Chung [128] | 7-6,7-6 | |
| Mubadala World Tennis Championship | 12/19 14:00 | 27 | [17] Karen Khachanov v Hyeon Chung [128] | 7-6,6-4 | |
| Mubadala World Tennis Championship | 12/19 14:00 | 27 | Daniil Medvedev v Hyeon Chung | Cancelled | |
| ATP Wiedeń | 10/24 15:00 | 26 | [139] Hyeon Chung v Andrey Rublev [22] | 4-6,2-6 | |
| ATP Wiedeń | 10/22 13:55 | 25 | [139] Hyeon Chung v Milos Raonic [32] | 6-4,7-5 | |
| ATP Sztokholm | 10/13 13:05 | 64 | Hyeon Chung v Cedrik-Marcel Stebe | 6-3,3-6,3-6 | |
| ATP Tokio | 10/04 10:00 | 27 | [15] David Goffin v Hyeon Chung [143] | 6-2,6-2 | |
| ATP Tokio | 10/03 07:40 | 26 | [143] Hyeon Chung v Marin Čilić [30] | 6-4,3-6,6-1 | |
| ATP Tokio | 09/30 09:30 | 25 | [54] Lorenzo Sonego v Hyeon Chung [143] | 6-3,3-6,4-6 | |
| ATP Chengdu | 09/25 05:00 | 25 | [145] Hyeon Chung v Joao Sousa [62] | 6-1,3-6,4-6 | |
| US Open | 08/31 17:55 | 25 | [170] Hyeon Chung v Rafael Nadal [2] | 3-6,4-6,2-6 | |
| US Open | 08/29 22:55 | 24 | [34] Fernando Verdasco v Hyeon Chung [170] | 6-1,6-2,5-7,3-6,6-7 | |
| US Open | 08/27 19:05 | 23 | [170] Hyeon Chung v Ernesto Escobedo [206] | 3-6,6-4,6-7,6-4,6-2 | |
| US Open | 08/23 17:45 | 46 | [107] Mikael Ymer v Hyeon Chung [151] | 1-6,3-6 | |
| US Open | 08/21 18:35 | 45 | [211] Stefano Napolitano v Hyeon Chung [151] | 2-6,3-6 |