Jun Woong-sun (born 14 June 1986) is a professional South Korean tennis player.

Jun reached his highest individual ranking on the ATP Tour on May 26, 2008, when he became World number 230. He plays primarily on the Futures circuit and the Challenger circuit.

Jun has been a member of the South Korean Davis Cup team, posting a 9–5 record in singles and a 3–3 record in doubles in twelve ties played.

Tour singles titles – all levels (2–2)

Legend (singles)
Grand Slam (0–0)
Tennis Masters Cup (0–0)
ATP Masters Series (0–0)
ATP Tour (0–0)
Challengers (0–2)
Futures (2–0)
Outcome No. Date Tournament Surface Opponent in the final Score
Winner 1. 17 April 2006 Kofu, Japan Carpet Japan Tetsuya Chaen 7–6, 7–5
Winner 2. 24 April 2006 Shizuoka, Japan Carpet South Korea Kim Son-yong 2–6, 6–3, 6–3
Runner-up 1. 25 June 2007 Almaty, Kazakhstan Clay Germany Simon Greul 3–6, 2–6
Runner-up 2. 5 May 2008 Dresden, Germany Clay Germany Andreas Beck 6–2, 3–6, 5–7


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