An Jae-sung (born 28 May 1985) is a retired South Korean tennis player.
An has a career high ATP singles ranking of 289 achieved on 14 April 2008. He also has a career high doubles ranking of 454 achieved on 18 August 2008.
Early life and career An attended Konkuk University. While a student, he represented South Korea in tennis at the 2006 Asian Games in Doha, Qatar, where he and his teammates won a gold medal in the men's team event, thus securing an exemption from his mandatory military service.
An has been a member of the South Korea Davis Cup team from 2005 until 2008, competing in the World Group first round tie in 2008 against Germany.
In 2008, he captured his only ATP Challenger Tour doubles title in Moncton, Canada.
He retired in 2014, and now runs a tennis academy in Jeju.
ATP Challenger and ITF Futures finals
Singles: 11 (3–8) ATP Challenger (0–1)ITF Futures (3–7)
ResultW–LDateTournamentTierSurfaceOpponentScoreLoss 0–1 Karuizawa, JapanFutures Clay Kwon Oh-hee 2–6, 5–7Loss 0–2 Kōfu, JapanFutures Carpet Kwon Hyung-tae 5–7, 1–6Win 1–2 Seogwipo, South KoreaFutures Hard Norikazu Sugiyama 3–6, 6–3, 6–2Win 2–2 Khon Kaen, ThailandFutures Hard Simon Rea 6–4, 6–1Loss 2–3 Chiang Mai, ThailandFutures Hard Justin Diao Natale 4–6, 4–6Loss 0–1 New Delhi, IndiaChallenger Hard Aisam-ul-Haq Qureshi 5–7, 4–6Loss 2–4 Nishitōkyō, JapanFutures Hard Gouichi Motomura 7–5, 1–6, 2–6Win 3–4 Kōfu, JapanFutures Hard Yūichi Sugita 5–7, 6–4, 7–6(7–5)Loss 3–5 Tarakan, IndonesiaFutures Hard (i) Christopher Rungkat 3–6, 6–0, 2–6Loss 3–6 Shenzhen, ChinaFutures Hard Zhang Ze 4–6, 2–6Loss 3–7 Taipei, TaiwanFutures Hard Hiroki Moriya 3–6, 6–4, 3–6
Doubles: 17 (9–8) ATP Challenger (1–0)ITF Futures (8–8)
ResultW–LDateTournamentTierSurfacePartnerOpponentsScoreLoss 0–1 Seogwipo, South KoreaFutures Hard Im Kyu-tae Kim Dong-hyun Kwon Oh-hee 6–7(2–7), 2–6 Win 1–1 Andong, South KoreaFutures Hard Chung Hee-seok Jun Woong-sun Kim Sun-yong 7–5, 6–4Win 2–1 Andong, South KoreaFutures Hard Kwon Hyung-tae Im Kyu-tae Takahiro Terachi 3–6, 4–6Loss 2–2 Kusatsu, JapanFutures Carpet Kim Dong-hyun Yaoki Ishii Joji Miyao 6–3, 4–6, 2–6Loss 2–3 Bangkok, ThailandFutures Hard Chung Hee-seok Yu Xinyuan Zeng Shaoxuan 2–6, 7–5, 4–6Loss 2–4 Nonthaburi, ThailandFutures Hard Chung Hee-seok Yu Xinyuan Zeng Shaoxuan 2–6, 6–4, 2–6Loss 2–5 Kōfu, JapanFutures Carpet Daniel Yoo Akito Higa Tomohiro Shinokawa 6–3, 4–6, 4–6Loss 2–6 Gimcheon, South KoreaFutures Hard Chung Hee-seok Óscar Burrieza Nikolai Nesterov 6–1, 7–5Win 1–0 Moncton, CanadaChallenger Hard Hiroki Kondo Daniel Chu Adil Shamasdin 6–2, 2–6, [12–10]Win 3–6 Seogwipo, South KoreaFutures Hard Lee Chul-hee Gary Lugassy Ludovic Walter 7–6(9–7), 7–5Win 4–6 Gimcheon, South KoreaFutures Hard Lim Yong-kyu Junn Mitsuhashi Yi Chu-huan 7–6(7–4), 6–4Win 5–6 Bandung, IndonesiaFutures Hard (i) Kim Young-jun Elbert Sie Karunuday Singh 6–2, 5–7, [10–8]Win 6–6 Daegu, South KoreaFutures Hard Kim Young-jun Jaan-Frederik Brunken Michael McClune 5–7, 7–5, [10–4]Loss 6–7 Cairns, AustraliaFutures Hard Elbert Sie Brydan Klein James Lemke w/oLoss 6–8 Kaohsiung, TaiwanFutures Hard Kim Young-jun Denis Matsukevich Frederik Nielsen 4–6, 1–6 Win 7–8 Ōarai, JapanFutures Hard Arata Onozawa Toshihide Matsui Yi Chu-huan 2–6, 6–1, [10–6]Win 8–8 Seoul, South KoreaFutures Hard Lim Yong-kyu Chung Hyeon Nam Ji-sung 6–3, 6–2
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