| UTR Pro Tennis Series - Teksas | 2021/09/20 17:30 | Brayden Michna v Rahul Dhokia | 3-6,6-3,3-6 |
| UTR Pro Tennis Series - Teksas | 2021/09/20 14:30 | Guido Marson v Pierce Rollins | 2-6,1-5 |
| ITF - Harlingen M25 | 2019/09/23 14:00 | Timo Stodder v Guido Marson | 6-4,6-3 |
| ITF USA F34 | 2018/11/24 16:00 | Alexis Gautier v Guido Marson | 6-3,6-2 |
| ITF USA F28 | 2018/10/15 14:35 | Guido Marson v Jonathan Chang | 4-6,2-6 |
| ITF USA F27 | 2018/10/06 18:00 | Chenhe Li v Guido Marson | 6-4,6-2 |
| ITF Italy F22 Qual | 2018/08/06 10:35 | Luca Narcisi v Guido Marson | 7-5,6-3 |
| ITF Italy F21 Qual | 2018/07/28 12:25 | Gianmarco Ferrari v Guido Marson | 6-4,6-2 |
| ITF Italy F20 Qual | 2018/07/22 13:00 | Emiliano Maggioli v Guido Marson | 6-4,6-2 |