Results
| Challenger Yokkaichi | 11/24 04:30 | 14 | Jisung Nam v Keisuke Saitoh | 1-6,3-6 | |
| Challenger Yokohama | 11/19 01:00 | 25 |
[125] Jisung Nam v
Shintaro Mochizuki
[252] 
|
2-6,2-6 | |
| Challenger Yokohama | 11/18 02:30 | 19 | [125] Jisung Nam v Naoki Nakagawa [381] | 6-3,6-3 | |
| Challenger Yokohama | 11/17 05:10 | 14 | [376] Philip Henning v Jisung Nam [123] | 6-7,6-3,5-7 | |
| Challenger Taipei | 10/20 07:05 | 14 | Ji Sung Nam v Reese Stalder | 5-7,5-7 | |
| Challenger Nonthaburi | 09/25 03:00 | 25 |
[122] Jisung Nam v
Gabriel Diallo
[105] 
|
6-7,0-6 | |
| Challenger Nonthaburi | 09/24 06:55 | 19 | [422] Andre Ilagan v Jisung Nam [122] | 4-6,4-6 | |
| Challenger Nonthaburi | 09/23 05:40 | 14 | Thantub Suksumrarn v Jisung Nam | 6-7,3-6 | |
| ITF M25 Takasaki | 09/18 01:00 | 25 | [122] Jisung Nam v Hiroki Moriya [403] | Retired | |
| Challenger Zhangjiagang | 08/25 04:30 | 14 | [133] Jisung Nam v Ajeet Rai [246] | 4-6,0-6 | |
| Challenger Jinan | 08/21 04:25 | 26 | [467] Keegan Smith v Jisung Nam [133] | 7-6,7-5 | |
| Challenger Jinan | 08/20 03:50 | 25 | Dominik Palan v Jisung Nam | 3-6,7-6,3-6 |
Wikipedia - Nam Ji-sung
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.