# 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.

## Challenger and Futures/World Tennis Tour finals
### Singles: 16 (5–11)

* Legend (singles)
* ATP Challenger Tour (0–2)
* ITF Futures/World Tennis Tour (5–9)
* Titles by surface
* Hard (3–10)
* Clay (2–1)
* Grass (0–0)
* Carpet (0–0)
| Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score |
| Win | 1–0 | Jun 2012 | Japan F5, Karuizawa | Futures | Clay | Adam El Mihdawy | 6–4, 6–4 |
| Loss | 1–1 | Jul 2012 | Indonesia F1, Jakarta | Futures | Hard | Christopher Rungkat | 6–7$^{(5–7)}$, 1–6 |
| Loss | 1–2 | Feb 2014 | Thailand F1, Nonthaburi | Futures | Hard | Chung Hyeon | 2–6, 6–7$^{(4–7)}$ |
| Loss | 1–3 | Jun 2016 | Korea F2, Sangju | Futures | Hard | Noh Sang-woo | 4–6, 1–6 |
| Win | 2–3 | Aug 2016 | Korea F6, Ansung | Futures | Clay (i) | Makoto Ochi | 5–7, 6–1, 6–1 |
| Loss | 2–4 | Sep 2016 | Korea F8, Ansung | Futures | Clay (i) | Lim Yong-kyu | 0–6, 3–6 |
| Loss | 2–5 | May 2018 | Vietnam F2, Thừa Thiên-Huế | Futures | Hard | Rio Noguchi | 6–7$^{(5–7)}$, 3–6 |
| Win | 3–5 | May 2018 | Vietnam F3, Thừa Thiên-Huế | Futures | Hard | Pruchya Isaro | 6–4, 6–2 |
| Loss | 3–6 | Jun 2018 | Korea F2, Gyeongsan | Futures | Hard | Chung Yun-seong | 4–6, 3–6 |
| Loss | 3–7 | Jun 2018 | Korea F3, Daegu | Futures | Hard | Chung Yun-seong | 1–6, 3–6 |
| Loss | 3–8 | Aug 2018 | Gwangju, Korea, Rep. | Challenger | Hard | Maverick Banes | 3–6, 6–4, 4–6 |
| Win | 4–8 | Aug 2018 | Korea F5, Gimcheon | Futures | Hard | Makoto Ochi | 6–4, 6–1 |
| Loss | 4–9 | Mar 2019 | M15 Nishi-Tama, Japan | World Tennis Tour | Hard | Shintaro Imai | 2–6, 2–6 |
| Loss | 4–10 | May 2019 | M25 Nonthaburi, Thailand | World Tennis Tour | Hard | Shuichi Sekiguchi | 1–6, 4–6 |
| Loss | 4–11 | Jun 2019 | Columbus, USA | Challenger | Hard (i) | Mikael Torpegaard | 1–6, 5–7 |
| Win | 5–11 | Apr 2022 | M15 Chiang Rai, Thailand | World Tennis Tour | Hard | Bai Yan | 6–2, 6-4 |

### Doubles: 70 (36 titles, 34 runners-up)

* Legend (doubles)
* ATP Challenger Tour (9–13)
* ITF Futures Tour (27–21)
* Titles by surface
* Hard (32–32)
* Clay (4–2)
* Grass (0–0)
* Carpet (0–0)
| Result | W–L | Date | Tournament | Tier | Surface | Partner | Opponents | Score |
| Loss | 0–1 | Apr 2011 | Australia F3, Ipswich | Futures | Clay | Cho Soong-jae | James Lemke Dane Propoggia | 7–6$^{(7–4)}$, 2–6, [5–10] |
| Win | 1–1 | May 2012 | China F7, Zhangjiagang | Futures | Hard | Noh Sang-woo | Gong Maoxin Xue Feng | 6–2, 6–4 |
| Win | 2–1 | Jul 2012 | Indonesia F2, Jakarta | Futures | Hard | Lim Yong-kyu | Gao Peng Gao Wan | 6–2, 6–0 |
| Loss | 2–2 | Aug 2012 | USA F23, Edwardsville | Futures | Hard | Chung Hyeon | Daniel Nguyen Ryan Rowe | 3–6, 5–7 |
| Loss | 2–3 | Oct 2012 | Seoul, Korea, Rep. | Challenger | Hard | Lim Yong-kyu | Lee Hsin-han Peng Hsien-yin | 6–7$^{(3–7)}$, 5–7 |
| Loss | 2–4 | Mar 2013 | USA F7, Calabasas | Futures | Hard | Lim Yong-kyu | Saketh Myneni Sanam Singh | 7–6$^{(7–3)}$, 2–6, [12–14] |
| Loss | 2–5 | Mar 2013 | USA F8, Costa Mesa | Futures | Hard | Cho Min-hyeok | Michael McClune Michael Venus | 1–6, 3–6 |
| Loss | 2–6 | May 2013 | Korea F2, Seoul | Futures | Hard | Chung Hyeon | An Jae-sung Lim Yong-kyu | 3–6, 2–6 |
| Loss | 2–7 | May 2013 | Korea F3, Daegu | Futures | Hard | Lim Yong-kyu | Dane Propoggia Rubin Statham | 1–6, 2–6 |
| Win | 3–7 | Jun 2013 | Korea F4, Changwon | Futures | Hard | Lim Yong-kyu | Laurynas Grigelis Enrique López Pérez | 5–7, 6–4, [11–9] |
| Loss | 3–8 | Jun 2013 | Korea F7, Gimcheon | Futures | Hard | Lim Yong-kyu | Huang Liang-chi Enrique López Pérez | 4–6, 2–6 |
| Loss | 3–9 | Aug 2013 | China F7, Tianjin | Futures | Hard | Chung Hyeon | Sriram Balaji Ranjeet Virali-Murugesan | 3–6, 2–6 |
| Loss | 3–10 | Sep 2013 | Bangkok, Thailand | Challenger | Hard | Jeong Suk-young | Chen Ti Huang Liang-chi | 3–6, 2–6 |
| Win | 4–10 | Feb 2014 | Thailand F2, Nonthaburi | Futures | Hard | Chung Hyeon | Lewis Burton Marcus Willis | 6–4, 6–7$^{(4–7)}$, [10–7] |
| Loss | 4–11 | Mar 2014 | Thailand F3, Nonthaburi | Futures | Hard | Chung Hyeon | Lewis Burton Marcus Willis | 3–6, 5–7 |
| Loss | 4–12 | Mar 2014 | China F3, Yuxi | Futures | Hard | Lim Yong-kyu | Li Zhe Wu Di | 4–6, 4–6 |
| Loss | 4–13 | May 2014 | Korea F2, Seoul | Futures | Hard | Chung Hong | Dane Propoggia Ruan Roelofse | 0–6, 3–6 |
| Win | 5–13 | Jun 2014 | Korea F3, Changwon | Futures | Hard | Chung Hyeon | Cho Soong-jae Kim Dylan Seong-kwan | 6–3, 6–3 |
| Win | 6–13 | Jul 2014 | China F9, Zhangjiagang | Futures | Hard | Cho Min-hyeok | Qiu Zhuoyang Te Rigele | 6–3, 6–4 |
| Loss | 6–14 | May 2015 | Busan, Korea, Rep. | Challenger | Hard | Song Min-kyu | Sanchai Ratiwatana Sonchat Ratiwatana | 6–7$^{(2–7)}$, 6–3, [7–10] |
| Loss | 6–15 | May 2015 | Korea F1, Daegu | Futures | Hard | Song Min-kyu | Hong Seong-chan Lee Hyung-taik | 3–6, 3–6 |
| Win | 7–15 | May 2015 | Korea F2, Changwon | Futures | Hard | Song Min-kyu | Choi Jae-won Kim Hyun-joon | 6–2, 5–7, [10–6] |
| Win | 8–15 | Aug 2015 | Korea F5, Gimcheon | Futures | Hard | Noh Sang-woo | Gengo Kikuchi Shunrou Takeshima | 6–3, 7–6$^{(7–3)}$ |
| Loss | 8–16 | Sep 2015 | Korea F6, Ansung | Futures | Clay (i) | Noh Sang-woo | Kwon Soon-woo Son Ji-hoon | 7–6$^{(7–4)}$, 3–6, [11–13] |
| Win | 9–16 | Jun 2016 | Korea F2, Sangju | Futures | Hard | Song Min-kyu | Chung Yun-seong Lim Yong-kyu | 6–4, 6–4 |
| Win | 10–16 | Jul 2016 | Korea F4, Gimcheon | Futures | Hard | Song Min-kyu | Shintaro Imai Takuto Niki | 6–4, 6–4 |
| Loss | 10–17 | Jul 2016 | Korea F5, Gimcheon | Futures | Hard | Song Min-kyu | Kim Cheong-eui Noh Sang-woo | 6–7$^{(5–7)}$, 7–6$^{(7–4)}$, [4–10] |
| Win | 11–17 | Sep 2016 | Korea F8, Ansung | Futures | Clay (i) | Song Min-kyu | Katsuki Nagao Hiromasa Oku | 6–4, 6–4 |
| Win | 12–17 | May 2018 | Vietnam F3, Thừa Thiên-Huế | Futures | Hard | Song Min-kyu | Kittirat Kerdlaphee Palaphoom Kovapitukted | 6–1, 6–4 |
| Win | 13–17 | Jun 2018 | Korea F1, Sangju | Futures | Hard | Lim Yong-kyu | Alec Adamson Clément Larrière | 4–6, 6–4, [10–5] |
| Win | 14–17 | Jun 2018 | Korea F2, Gyeongsan | Futures | Hard | Lim Yong-kyu | John Paul Fruttero Takuto Niki | 6–4, 6–1 |
| Win | 15–17 | Jul 2018 | China F9, Shenzhen | Futures | Hard | Song Min-kyu | Gao Xin Wang Aoran | 3–6, 6–4, [10–4] |
| Win | 16–17 | Jul 2018 | China F10, Shenzhen | Futures | Hard | Song Min-kyu | Chen Ti Rubin Statham | 7–6$^{(7–3)}$, 6–2 |
| Win | 17–17 | Aug 2018 | Gwangju, Korea, Rep. | Challenger | Hard | Song Min-kyu | Benjamin Lock Rubin Statham | 5–7, 6–3, [10–5] |
| Loss | 17–18 | Aug 2018 | Korea F5, Gimcheon | Futures | Hard | Son Ji-hoon | Chung Hong Noh Sang-woo | 6–7$^{(4–7)}$, 6–4, [8–10] |
| Win | 18–18 | Mar 2019 | M15 Nishitokyo, Japan | World Tennis Tour | Hard | Song Min-kyu | Shintaro Imai Takuto Niki | 4–6, 7–6$^{(7–4)}$, [10–7] |
| Loss | 18–19 | Apr 2019 | M15 Kashiwa, Japan | World Tennis Tour | Hard | Kim Cheong-Eui | Yusuke Takahashi Jumpei Yamasaki | 1–6, 3–6 |
| Loss | 18–20 | Apr 2019 | M25 Matsuyama, Japan | World Tennis Tour | Hard | Kim Cheong-Eui | Shinji Hazawa Naoki Tajima | 6–4, 1–6, [7–10] |
| Loss | 18–21 | May 2019 | Gwangju, Korea, Rep. | Challenger | Hard | Song Min-kyu | Hsieh Cheng-peng Christopher Rungkat | 3–6, 6–3, [6–10] |
| Win | 19–21 | May 2019 | M25 Nonthaburi, Thailand | World Tennis Tour | Hard | Song Min-kyu | Sanchai Ratiwatana Sonchat Ratiwatana | 7–6$^{(10–8)}$, 6–1 |
| Loss | 19–22 | Jul 2019 | Nur-Sultan, Kazakhstan | Challenger | Hard | Chung Yun-seong | Andrey Golubev Aleksandr Nedovyesov | 4–6, 4–6 |
| Loss | 19–23 | Aug 2019 | Chengdu, China, P.R. | Challenger | Hard | Song Min-kyu | Arjun Kadhe Saketh Myneni | 3–6, 6–0, [6–10] |
| Win | 20–23 | Aug 2019 | Yokkaichi, Japan | Challenger | Hard | Song Min-kyu | Gong Maoxin Zhang Ze | 6–3, 3–6, [14–12] |
| Win | 21–23 | Aug 2019 | Baotou, China, P.R. | Challenger | Clay (i) | Song Min-kyu | Teymuraz Gabashvili Sasikumar Mukund | 7–6$^{(7–3)}$, 6–2 |
| Loss | 21–24 | Sep 2019 | Jinan, China, P.R. | Challenger | Hard | Song Min-kyu | Matthew Ebden Divij Sharan | 6–7$^{(4–7)}$, 7–5, [3–10] |
| Loss | 21–25 | Oct 2019 | Liuzhou, China, P.R. | Challenger | Hard | Song Min-kyu | Denis Istomin Mikhail Elgin | 6–3, 4–6, [6–10] |
| Win | 22–25 | Nov 2019 | M15 Nonthaburi, Thailand | World Tennis Tour | Hard | Chung Hong | Lee Jea-moon Song Min-kyu | 1–6, 6–3, [10–7] |
| Win | 23–25 | Jun 2021 | M15 Monastir, Tunisia | World Tennis Tour | Hard | Hong Seong-chan | Matías Franco Descotte Filip Peliwo | 6–3, 6–1 |
| Win | 24–25 | Jun 2021 | M15 Monastir, Tunisia | World Tennis Tour | Hard | Hong Seong-chan | Timur Kiyamov Kelsey Stevenson | 6–2, 6–4 |
| Win | 25–25 | Jan 2022 | M15 Antalya, Turkey | World Tennis Tour | Clay | Hong Seong-chan | Dragoș Nicolae Mădăraș Oleksandr Ovcharenko | 6–3, 6–3 |
| Win | 26–25 | Jan 2022 | M15 Antalya, Turkey | World Tennis Tour | Clay | Hong Seong-chan | Sarp Ağabigün Alexandru Jecan | 6–4, 6–4 |
| Win | 27–25 | Mar 2022 | M25 Bakersfield, United States | World Tennis Tour | Hard | Song Min-kyu | Daniel Cukierman Ruan Roelofse | 6–2, 6–0 |
| Win | 28–25 | Mar 2022 | M25 Calabasas, United States | World Tennis Tour | Hard | Song Min-kyu | Charles Broom Henry Patten | 6–3, 7–6$^{(7–4)}$ |
| Loss | 28–26 | Apr 2022 | M15 Chiang Rai, Thailand | World Tennis Tour | Hard | Song Min-kyu | Hong Seong-chan Kim Cheong-Eui | 6–4, 6–7$^{(2–7)}$, [8–10] |
| Win | 29–26 | Apr 2022 | M15 Chiang Rai, Thailand | World Tennis Tour | Hard | Song Min-kyu | Shinji Hazawa Takuto Niki | 6–1, 6–4 |
| Win | 30–26 | Apr 2022 | M15 Chiang Rai, Thailand | World Tennis Tour | Hard | Song Min-kyu | Bai Yan Kim Cheong-Eui | 6–2, 6–4 |
| Loss | 30–27 | Jun 2022 | M25 Harmon, Guam | World Tennis Tour | Hard | Song Min-kyu | Toshihide Matsui Kaito Uesugi | 3–6, 6–0, [7–10] |
| Win | 31–27 | Jul 2022 | Nur-Sultan, Kazakhstan | Challenger | Hard | Song Min-kyu | Andrew Paulson David Poljak | 6–2, 3–6, [10–6] |
| Loss | 31–28 | Aug 2022 | Nonthaburi, Thailand | Challenger | Hard | Song Min-kyu | Evgeny Donskoy Alibek Kachmazov | 3–6, 6–1, [7–10] |
| Loss | 31–29 | Oct 2022 | Busan, South Korea | Challenger | Hard | Song Min-kyu | Marc Polmans Max Purcell | 7–6$^{(7–5)}$, 2–6, [10–12] |
| Win | 32–29 | Jan 2023 | Nonthaburi, Thailand | Challenger | Hard | Song Min-kyu | Jan Choinski Stuart Parker | 6–4, 6–4 |
| Win | 33–29 | Jun 2023 | Little Rock, USA | Challenger | Hard | Artem Sitak | Alexis Galarneau Nicolas Moreno de Alboran | 6–4, 6–4 |
| Win | 34–29 | Jul 2023 | Pozoblanco, Spain | Challenger | Hard | Song Min-kyu | Luke Johnson Benjamin Lock | 2–6, 6–4, [10–8] |
| Loss | 34–30 | Nov 2023 | Sydney, Australia | Challenger | Hard | Ruben Gonzales | Ryan Seggerman Patrik Trhac | 4–6, 4–6 |
| Loss | 34–31 | Nov 2023 | Kobe, Japan | Challenger | Hard | Andrew Harris | Evan King Reese Stalder | 6–7$^{(3–7)}$, 6–2, [7–10] |
| Loss | 34–32 | Mar 2024 | M15 Tsukuba, Japan | World Tennis Tour | Hard | Ray Ho | Yusuke Kusuhara Shunsuke Nakagawa | 5–7, 6–7 $^{(4–7)}$ |
| Loss | 34–33 | Apr 2024 | M15 Kashiwa, Japan | World Tennis Tour | Hard | Ray Ho | Masamichi Imamura Takeru Yuzuki | 6–4, 2–6, [8-10] |
| Win | 35–33 | Apr 2024 | Busan, South Korea | Challenger | Hard | Ray Ho | Chung Yun-seong Hsu Yu-hsiou | 6–2, 6–4 |
| Loss | 35–34 | Apr 2024 | Guangzhou, China | Challenger | Hard | Patrik Niklas-Salminen | Blake Ellis Tristan Schoolkate | 6–2, 6–4 |
| Win | 36–34 | May 2024 | Taipei, Taiwan | Challenger | Hard | Ray Ho | Toshihide Matsui Kaito Uesugi | 6–2, 6–2 |