| Challenger Yokohama | 11/17 01:00 | 19 | [485] Igor Marcondes v Jisung Nam [168] | 6-4,6-4 | |
| Challenger Yokohama | 11/16 04:00 | 14 | Nathan Trouve v Jisung Nam | 0-6,1-6 | |
| Challenger Kobe | 11/11 03:20 | 25 | [296] Hynek Barton v Jisung Nam [168] | 6-7,6-4,7-6 | |
| Challenger Kobe | 11/10 03:30 | 19 |
[322] Duje Ajdukovic
v
Jisung Nam [168] |
4-6,7-5,4-6 | |
| Challenger Kobe | 11/09 06:10 | 14 | [167] Jisung Nam v Tsung-Hao Huang [474] | 6-2,6-3 | |
| Challenger Taipei | 11/04 10:25 | 25 |
[167] Jisung Nam v
Jurij Rodionov
[161]
|
6-2,6-7,2-6 | |
| Challenger Taipei | 11/03 05:00 | 19 | [158] Jisung Nam v Takeru Yuzuki [85] | 7-6,6-1 | |
| Challenger Taipei | 11/02 06:00 | 14 | Jisung Nam v Ren Nakamura | 6-1,6-2 | |
| Challenger Seoul | 10/27 02:00 | 19 | [140] Jisung Nam v Uisung Park [220] | 4-6,1-6 | |
| Challenger Seoul | 10/26 05:50 | 14 | [426] Neil Oberleitner v Jisung Nam [140] | 3-6,6-4,1-6 | |
| Challenger Zhangjiagang | 08/25 12:35 | 19 | [195] Tsung-Hao Huang v Jisung Nam [148] | 6-2,6-4 | |
| Challenger Zhangjiagang | 08/24 03:50 | 14 | [173] Niki Kaliyanda Poonacha v Jisung Nam [146] | Retired |
Nam Ji-sung (born 15 August 1993) is a South Korean tennis player. He has a career high ATP singles ranking of world No. 236 achieved on 12 August 2019. He also has a career high ATP doubles ranking of No. 102 achieved on 3 February 2020. In 2024, he became the first Korean in 13 years to win the Busan Open in doubles.
Playing for South Korea in Davis Cup, Nam has a W/L record of 3–7.