| UTR Pro Tennis Series California | 2021/10/15 16:30 | Yanais Laurent v Karl Lee | 2-6,0-6 |
| UTR Pro Tennis Series California | 2021/10/14 19:30 | JC Aragone v Karl Lee | 7-5,6-3 |
| UTR Pro Tennis Series California | 2021/10/13 16:30 | Rithvik Krishna v Karl Lee | 3-6,3-5 |
| UTR Pro Tennis Series California | 2021/10/11 16:30 | Julien Evrard v Karl Lee | 4-6,4-5 |
| UTR Pro Tennis Series California | 2021/07/20 15:00 | Karl Lee v Julian Steinhausen | 3-6,6-7 |
| UTR Pro Tennis Series California | 2021/07/18 22:47 | Karl Lee v Nevin Arimilli | 5-7,6-7 |
| UTR Pro Tennis Series Nevada | 2021/07/03 16:30 | Bjorn Swenson v Karl Lee | 6-2,5-2 |
| UTR Pro Tennis Series Nevada | 2021/06/30 15:00 | Karl Lee v Aaron Bailey | 6-2,6-4 |
| UTR Pro Tennis Series California | 2021/10/15 18:00 | Ryan Seggerman v Chase Thompson | 6-4,6-2 |
| UTR Pro Tennis Series California | 2021/10/13 19:30 | Ryan Seggerman v Kris Van Wyk | 3-6,6-3,5-3 |
| UTR Pro Tennis Series California | 2021/10/12 18:00 | Ryan Seggerman v Alex Michelsen | 4-6,6-4,3-5 |
| UTR Pro Tennis Series California | 2021/10/11 19:30 | Nicholas Campbell v Ryan Seggerman | 7-6,2-6,6-2 |
| UTR Pro Tennis Series Sacramento | 2021/10/10 17:30 | Ryan Seggerman v Tomas Kopczynski | 6-3,4-1 |
| UTR Pro Tennis Series Sacramento | 2021/10/09 18:00 | Ryan Seggerman v Suraj Prabodh | 6-2,5-3 |
| UTR Pro Tennis Series Sacramento | 2021/10/08 21:00 | Francis Casey Alcantara v Ryan Seggerman | 7-6,6-6 |
| UTR Pro Tennis Series Sacramento | 2021/10/07 19:30 | Jeremy Field v Ryan Seggerman | 5-7,4-5 |