| Full name | Nam Ji-sung |
|---|---|
| Country (sports) |  South Korea |
| Residence | Seoul, South Korea |
| Born | 15 August 1993 Busan, South Korea |
| Plays | Right-handed (two handed-backhand) |
| Prize money | $293,832 |
| Singles | |
| Career record | 3–6 |
| Career titles | 0 |
| Highest ranking | No. 236 (12 August 2019) |
| Current ranking | No. 708 (15 April 2024) |
| Grand Slam singles results | |
| Australian Open | Q1 (2020) |
| Doubles | |
| Career record | 9–14 |
| Career titles | 0 |
| Highest ranking | No. 102 (3 February 2020) |
| Current ranking | No. 123 (15 April 2024) |
| Grand Slam doubles results | |
| Australian Open | 2R (2020, 2021) |
| Team competitions | |
| Davis Cup | 3–7 |
| Last updated on: 15 April 2024. | |
| Nam Ji-sung | |
| Hangul | 남지성 |
|---|---|
| Revised Romanization | Nam Jiseong |
| McCune–Reischauer | Nam Chisŏng |
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.
Playing for South Korea in Davis Cup, Nam has a W/L record of 3–7.