| Country | South Korea |
|---|---|
| Residence | Seoul, South Korea |
| Born | 23 September 1973 Daegu, South Korea |
| Height | 1.75 m (5 ft 9 in) |
| Turned pro | 1996 |
| Plays | Right-handed |
| Career prize money | US$190,990 |
| Singles | |
| Career record | 20–20 |
| Career titles | 0 |
| Highest ranking | No. 140 (December 18, 2000) |
| Grand Slam results | |
| Australian Open | Q3 (1994, 1996, 1997) |
| French Open | Q2 (2001) |
| Wimbledon | 1R (2001) |
| US Open | 1R (1998) |
| Doubles | |
| Career record | 6–12 |
| Career titles | 0 |
| Highest ranking | No. 188 (May 14, 2001) |
| Medal record | ||
|---|---|---|
| Tennis | ||
| Competitor for South Korea | ||
| Asian Games | ||
| Gold | 1998 Bangkok | Men's Singles |
| Gold | 1998 Bangkok | Team Event |
| Silver | 1998 Bangkok | Men's Doubles |
| Silver | 2002 Busan | Team Event |
| Summer Universiade | ||
| Gold | 1995 Fukuoka | Men's Singles |
| Gold | 1997 Catania | Men's Singles |
| Gold | 1997 Catania | Men's Doubles |
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.
| 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 | Score |
| Winner | 1. | September 23, 1996 | Beijing, China | Hard | Xia Jia-Ping | 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 |