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| Rank | Player | Age | Tournament |
|---|---|---|---|
| 1 | 41y 154d | Houston WCT 1976 | |
| 2 | 40y 275d | North Conway 1975 | |
| 3 | 40y 246d | Gstaad 1975 | |
| 4 | 40y 169d | Houston WCT 1975 | |
| 5 | 39y 339d | Tokyo-2 1974 | |
| 6 | 39y 318d | Buenos Aires NTL 1968 | |
| 7 | 39y 313d | Sao Paulo NTL-1 1968 | |
| 8 | 39y 312d | Toronto 1968 | |
| 9 | 38y 340d | Tokyo 1973 | |
| 10 | 38y 333d | Osaka 1973 | |
| 11 | 38y 166d | Charlotte WCT 1973 | |
| 12 | 38y 151d | Houston WCT 1973 | |
| 13 | 38y 117d | Umag 2023 | |
| 14 | 38y 42d | Bastad 2024 | |
| 15 | 37y 362d | Geneva 2025 | |
| 16 | 37y 167d | Charlotte WCT 1972 | |
| 17 | 37y 152d | Houston WCT 1972 | |
| 18 | 37y 139d | Hilton Head WCT 1972 | |
| 19 | 37y 117d | Hollywood WCT 1972 | |
| 20 | 37y 71d | World Invitational Tennis Classic 1975 |
