| UTR Pro Tennis Series California | 2021/12/05 16:00 | Ethan Schiffman v Arthur Bellegy | 4-6,5-6 |
| UTR Pro Tennis Series California | 2021/12/03 16:00 | Ryan Nuno v Arthur Bellegy | 7-5,5-2 |
| UTR Pro Tennis Series California | 2021/12/02 18:30 | Alexander Stater v Arthur Bellegy | 0-2 |
| UTR Pro Tennis Series California | 2021/11/30 21:51 | Eric Hadigian v Arthur Bellegy | 3-6,6-2,5-2 |
| UTR Pro Tennis Series California | 2021/11/29 20:00 | Arthur Bellegy v Alex Kuperstein | 0-6,4-6 |
| UTR Pro Tennis Series California | 2021/11/19 19:20 | Alexander Stater v Arthur Bellegy | 7-6,7-5 |
| UTR Pro Tennis Series California | 2021/11/17 22:15 | Alex Michelsen v Arthur Bellegy | 6-0,6-3 |
| UTR Pro Tennis Series California | 2021/11/16 23:30 | Aaron Bailey v Arthur Bellegy | 1-6,4-5 |
| ATP Acapulco | 2021/03/14 03:05 | Collin Altamirano v Damir Dzumhur | 6-4,6-7,0-6 |
| UTR Pro Tennis Series California | 2021/02/23 16:00 | Collin Altamirano v Colton Smith | 6-3,5-2 |
| UTR Pro Tennis Series California | 2021/02/22 18:00 | Collin Altamirano v Alexander Sarkissian | 5-7,3-6 |
| Challenger Lima | 2020/11/24 15:00 | Jesper De Jong v Collin Altamirano | 6-2,6-4 |
| Challenger Lima | 2020/11/22 15:00 | Collin Altamirano v Thiago Agustin Tirante | 4-6,4-6 |
| UTR Pro Tennis Series California | 2020/07/03 16:00 | Collin Altamirano v Felix Corwin | 4-6,2-6 |
| UTR Pro Tennis Series California | 2020/07/02 19:25 | Keegan Smith v Collin Altamirano | 6-4,6-4 |
| UTR Pro Tennis Series California | 2020/07/01 16:00 | Collin Altamirano v Dusty H. Boyer | 7-6,6-7,10-1 |