| ITF M15 Monastir | 06/09 11:15 | 25 | Ji Sung Nam v Devin Badenhorst | 6-7,6-2,7-6 | |
| ATP Great Ocean Road Open | 02/02 01:00 | 24 |
Ji Sung Nam v
Dane Sweeny
|
6-7,5-7 | |
| ATP Delray Beach | 01/07 17:30 | 25 |
[52] Tommy Paul
v
Ji Sung Nam [268] |
6-1,6-4 | |
| Davis Cup | 03/07 11:20 | 45 |
Fabio Fognini
v
Ji Sung Nam |
Cancelled | |
| Davis Cup | 03/06 14:10 | 45 |
[79] Gianluca Mager
v
Ji Sung Nam [238] |
6-3,7-5 | |
| Challenger Columbus | 02/27 17:10 | 26 |
[243] Ji Sung Nam v
Marc Polmans
[123] 
|
3-6,5-7 | |
| Challenger Columbus | 02/26 18:25 | 25 | [243] Ji Sung Nam v Lloyd Glasspool [447] | 6-3,6-2 | |
| Challenger Drummondville | 02/20 16:55 | 26 |
[115] Christopher O'Connell
v
Ji Sung Nam [242] |
6-1,4-6,6-4 | |
| Challenger Drummondville | 02/19 18:00 | 25 | Evan Song v Ji Sung Nam | 2-6,1-6 | |
| Challenger Cleveland | 02/11 19:50 | 25 | [245] Ji Sung Nam v Raymond Sarmiento [431] | 3-6,2-6 | |
| Australian Open | 01/14 01:25 | 44 | [198] Frederico Ferreira Silva v Ji Sung Nam [241] | 2-6,6-4,6-4 | |
| Challenger Noumea | 01/07 00:00 | 24 | [186] Joao Menezes v Ji Sung Nam [240] | 4-6,6-1,6-3 | |
| Challenger Noumea | 01/05 23:30 | 28 |
[240] Ji Sung Nam v
Tung-Lin Wu
[230] 
|
6-4,3-6,6-3 | |
| Australian Open WC | 12/06 03:55 | 27 | [252] Ji Sung Nam v Tatsuma Ito [148] | 6-3,1-6,1-6 | |
| Australian Open WC | 12/04 03:50 | 26 |
Bu Yunchaokete
v
Ji Sung Nam |
4-6,0-6 | |
| ITF M15 Nonthaburi | 11/30 03:00 | 28 | [307] Shintaro Imai v Ji Sung Nam [252] | 7-6,7-6 | |
| ITF M15 Nonthaburi | 11/29 02:55 | 27 | Sora Fukuda v Ji Sung Nam | 2-6,1-6 | |
| ITF M15 Nonthaburi | 11/28 02:30 | 26 | Takashi Saito v Ji Sung Nam | 7-5,3-6,1-6 | |
| ITF M15 Nonthaburi | 11/26 07:20 | 25 | Taisei Ichikawa v Ji Sung Nam | 5-7,2-6 | |
| Challenger Kobe | 11/08 03:00 | 27 |
[259] Ji Sung Nam v
Yosuke Watanuki
[302] 
|
Retired | |
| Challenger Kobe | 11/07 02:00 | 26 | Yuki Mochizuki v Ji Sung Nam | 3-6,6-1,1-6 | |
| Challenger Kobe | 11/06 02:55 | 25 | Ben Patael v Ji Sung Nam | 2-6,4-6 | |
| Challenger Shenzhen 2 | 10/29 03:45 | 24 | [261] Ji Sung Nam v Zhe Li [243] | 2-6,1-6 | |
| Challenger Liuzhou | 10/23 02:30 | 25 | [262] Ji Sung Nam v Danilo Petrovic [195] | 3-6,4-6 | |
| Challenger Liuzhou | 10/22 02:00 | 24 | [262] Ji Sung Nam v Kaichi Uchida [284] | 6-3,7-6 | |
| Challenger Ningbo | 10/17 04:55 | 26 | [275] Ji Sung Nam v Bradley Klahn [104] | 6-7,6-7 | |
| Challenger Ningbo | 10/16 03:35 | 25 | [186] Andrew Harris v Ji Sung Nam [275] | 3-6,5-7 | |
| Challenger Ningbo | 10/14 08:25 | 24 | Ji Sung Nam v Shuichi Sekiguchi | 6-1,6-1 | |
| Challenger Kaohsiung | 09/20 06:50 | 27 |
[300] Ji Sung Nam v
Marc Polmans
[158]
|
6-3,1-6,4-6 | |
| Challenger Kaohsiung | 09/19 03:00 | 26 | [300] Ji Sung Nam v Andrew Harris [189] | 6-2,6-2 |
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.