Yoon Yong-il
Yoon Yong-Il 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)
| Outcome | No. | Date | Tournament | Surface | Opponent in the final | Score |
| Winner | 1. | September 23, 1996 |  Beijing, China | Hard | Xia Jiaping | 6–4, 2–6, 6–1 |
| Winner | 2. | May 4, 1998 | Beijing, China | Hard |  Hideki Kaneko | 6–3, 7–5 |
| Runner-up | 1. | May 11, 1998 | Tianjin, China | Hard | Hideki Kaneko | 4–6, 7–6, 0–6 |
| Runner-up | 2. | October 5, 1998 | Maishima, Japan | Carpet |  Lee Hyung-Taik | 6–7, 6–2, 4–6 |
| Winner | 3. | July 5, 1999 |  Jakarta, Indonesia | Clay |  Rik De Voest | 7–6, 7–5 |
| Runner-up | 3. | July 26, 1999 |  St. Joseph, U.S. | Hard |  Thomas Dupre | 6–4, 4–6, 1–6 |
| Winner | 4. | August 9, 1999 | Kansas City, U.S. | Hard |  David Nalbandian | 6–3, 6–7, 6–2 |
| Winner | 5. | February 28, 2000 | Jakarta, Indonesia | Hard | Kwon Oh-hee | 6–2, 6–4 |
| Runner-up | 4. | May 8, 2000 | Fukuoka, Japan | Grass | Takahiro Terachi | 6–2, 6–7, 1–6 |
| Winner | 6. | May 15, 2000 | Osaka, Japan | Hard |  Paul Baccanello | 6–4, 6–7, 6–4 |
| Runner-up | 5. | May 22, 2000 | Seoul, South Korea | Clay | Park Seung-kyu | 5–7, 6–7 |
| Runner-up | 6. | July 24, 2000 | Winnetka, U.S. | Hard | Takao Suzuki | 2–6, 4–6 |
| Runner-up | 7. | August 7, 2000 | Binghamton, U.S. | Hard | Takao Suzuki | 1–6, 4–6 |
| Runner-up | 8. | November 27, 2000 |  Manila, Philippines | Hard |  Zbynek Mlynarik | 6–4, 0–6, 2–6 |
| Runner-up | 9. | December 4, 2000 | Manila, Philippines | Hard |  Danai Udomchoke | 3–6, 6–3, 5–7 |
| Winner | 7. | April 21, 2003 | Kumamoto, Japan | Hard |  Benjamin Kohlloeffel | 6–3, 6–2 |
| Runner-up | 10. | December 12, 2003 | Seogwipo, South Korea | Clay | Takahiro Terachi | 0–6, 5–7 |
