| 2002-02-08 | Davis Cup G1 QF: KOR vs JPN | Carpet | RR | 241 |  Gouichi Motomura | 284 |  Yong-Il Yoon | 3-6 6-2 6-2 6-3 | H2H | 5 | - | - | - | - | - | - | - |
| 2002-02-08 | Davis Cup G1 QF: KOR vs JPN | Carpet | RR | 228 | Takao Suzuki | 284 | Yong-Il Yoon | 7-5 6-4 6-3 | H2H | 5 | - | - | - | - | - | - | - |
| 2001-10-01 | Tokyo | Hard | R64 | 203 |  Tomas Zib | 185 | Yong-Il Yoon | 6-3 6-1 | H2H | 3 | 59 | 3 | 1 | 60.4% | 75.9% | 68.4% | 1/1 |
| 2001-09-17 | Shanghai | Hard | R16 | 144 |  Noam Behr | 194 | Yong-Il Yoon | 7-6(3) 6-7(6) 6-2 | H2H | 3 | 141 | 6 | 10 | 55.4% | 77.4% | 58.0% | 1/2 |
| 2001-09-17 | Shanghai | Hard | R32 | 194 | Yong-Il Yoon | - | Thomas Shimada (Q) | 6-4 6-4 | H2H | 3 | 71 | 2 | 1 | 47.5% | 72.4% | 71.9% | 2/2 |
| 2001-06-25 | Wimbledon | Grass | R128 | 7 |  Yevgeny Kafelnikov (7) | 160 | Yong-Il Yoon (Q) | 6-4 6-2 6-4 | H2H | 5 | 81 | 6 | 8 | 55.4% | 85.4% | 57.6% | 1/2 |
| 2001-04-06 | Davis Cup G1 PO: KOR vs INA | Hard | RR | 151 | Yong-Il Yoon | 291 |  Suwandi Suwandi | 6-3 7-6(3) 6-2 | H2H | 5 | - | - | - | - | - | - | - |
| 2000-10-09 | Tokyo | Hard | R16 | 14 |  Mark Philippoussis (3) | 205 | Yong-Il Yoon (Q) | 7-6(7) 6-4 | H2H | 3 | 81 | 17 | 1 | 65.2% | 88.9% | 54.2% | 2/2 |
| 2000-10-09 | Tokyo | Hard | R32 | 205 | Yong-Il Yoon (Q) | 60 |  David Prinosil (14) | 4-6 7-5 6-1 | H2H | 3 | 118 | 5 | 4 | 60.0% | 61.7% | 55.0% | 9/13 |
| 2000-10-09 | Tokyo | Hard | R64 | 205 | Yong-Il Yoon (Q) | 116 | Christian Vinck | 6-4 1-6 6-2 | H2H | 3 | 96 | 7 | 2 | 56.5% | 68.8% | 29.7% | 5/10 |
