Yoon Yong-Il (born September 23, 1973, in Daegu, South Korea) is a former professional South Korean tennis player.
Yoon reached his highest individual ranking on the ATP Tour on December 18, 2000, when he became World number 140. He played primarily on the Futures circuit and the Challenger circuit.
Yoon was a member of the South Korean Davis Cup team, posting a 16–10 record in singles and a 3–4 record in doubles in sixteen ties played.
Tour singles titles – all levels (7–10) Legend (singles) Grand Slam (0–0) Tennis Masters Cup (0–0) ATP Masters Series (0–0) ATP Tour (0–0) Challengers (1–2) Futures (6–8)
Outcome No. Date Tournament Surface Opponent in the final ScoreWinner 1. September 23, 1996 Beijing, China Hard Xia Jiaping 6–4, 2–6, 6–1Winner 2. May 4, 1998 Beijing, China Hard Hideki Kaneko 6–3, 7–5Runner-up 1. May 11, 1998 Tianjin, China Hard Hideki Kaneko 4–6, 7–6, 0–6Runner-up 2. October 5, 1998 Maishima, Japan Carpet Lee Hyung-Taik 6–7, 6–2, 4–6Winner 3. July 5, 1999 Jakarta, Indonesia Clay Rik De Voest 7–6, 7–5Runner-up 3. July 26, 1999 St. Joseph, U.S. Hard Thomas Dupré 6–4, 4–6, 1–6Winner 4. August 9, 1999 Kansas City, U.S. Hard David Nalbandian 6–3, 6–7, 6–2Winner 5. February 28, 2000 Jakarta, Indonesia Hard Kwon Oh-hee 6–2, 6–4Runner-up 4. May 8, 2000 Fukuoka, Japan Grass Takahiro Terachi 6–2, 6–7, 1–6Winner 6. May 15, 2000 Osaka, Japan Hard Paul Baccanello 6–4, 6–7, 6–4Runner-up 5. May 22, 2000 Seoul, South Korea Clay Park Seung-kyu 5–7, 6–7Runner-up 6. July 24, 2000 Winnetka, U.S. Hard Takao Suzuki 2–6, 4–6Runner-up 7. August 7, 2000 Binghamton, U.S. Hard Takao Suzuki 1–6, 4–6Runner-up 8. November 27, 2000 Manila, Philippines Hard Zbynek Mlynarik 6–4, 0–6, 2–6Runner-up 9. December 4, 2000 Manila, Philippines Hard Danai Udomchoke 3–6, 6–3, 5–7Winner 7. April 21, 2003 Kumamoto, Japan Hard Benjamin Kohllöffel 6–3, 6–2Runner-up 10. December 12, 2003 Seogwipo, South Korea Clay Takahiro Terachi 0–6, 5–7
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