| Challenger Gwangju | 04/17 02:00 | 26 | [248] Alibek Kachmazov v Jisung Nam [123] | 6-4,6-3 | |
| Challenger Gwangju | 04/16 02:00 | 25 | [123] Jisung Nam v Otto Virtanen [161] | 6-4,6-3 | |
| Challenger Busan | 04/08 04:30 | 25 | [269] Philip Sekulic v Jisung Nam [138] | 6-1,6-4 | |
| ITF M15 Kashiwa | 04/04 01:25 | 26 | Jisung Nam v Masamichi Imamura | 3-6,4-6 | |
| ITF M15 Kashiwa | 04/02 01:00 | 25 | Jisung Nam v Takuya Kumasaka | 7-6,3-6,6-4 | |
| ITF M25 Mildura | 03/12 02:05 | 25 | [289] Alex Bolt v Jisung Nam [141] | 7-6,6-2 | |
| Challenger Yokkaichi | 11/28 02:45 | 25 | [319] Kaichi Uchida v Jisung Nam [128] | 7-6,2-6,6-1 | |
| Challenger Yokkaichi | 11/27 02:15 | 19 | [131] Jisung Nam v Calum Puttergill [178] | 4-6,6-1,6-0 | |
| Challenger Yokkaichi | 11/26 04:10 | 14 | [426] Fajing Sun v Jisung Nam [131] | 3-6,2-6 | |
| Challenger Sydney | 11/03 00:00 | 27 | [146] Jisung Nam v Rinky Hijikata [80] | 7-6,5-7,6-7 | |
| Challenger Sydney | 11/01 23:00 | 26 | [146] Jisung Nam v Dane Sweeny [261] | 6-4,6-2 | |
| Challenger Sydney | 10/30 23:00 | 25 | [244] Tristan Schoolkate v Jisung Nam [146] | 6-7,4-6 |
Nam Ji-sung (born 15 August 1993, in Busan) is a South Korean tennis player.
Nam has a career high ATP singles ranking of 236 achieved on 12 August 2019. He also has a career high ATP doubles ranking of 102 achieved on 3 February 2020.
Playing for South Korea in Davis Cup, Nam has a W/L record of 3–7.