| Challenger - Cleveland | 2020/02/10 14:00 | Nick Chappell v Mostardi, Nico | 6-2,4-6,6-1 |
| UTR Pro Tennis Series Florida | 2020/12/14 16:00 | Mostardi, Nico v Johnson, Janmagnus | 7-6,4-6,1-5 |
| Challenger - Cleveland | 2020/02/10 14:00 | Nick Chappell v Mostardi, Nico | 6-2,4-6,6-1 |
| ITF M15 Pittsburgh | 2019/07/03 18:20 | Mostardi, Nico v Mercier, Tyler | 4-6,4-6 |
| ITF M15 Pittsburgh | 2019/07/02 14:00 | Mostardi, Nico v Zhang, Andrew | 4-6,6-4,11-9 |
| ITF M15 Pittsburgh | 2019/07/01 14:00 | Parker, Jordan v Mostardi, Nico | 4-6,4-6 |
| ITF USA F18 | 2018/06/25 14:00 | Alex Hernandez v Mostardi, Nico | 6-1,6-2 |
| ITF USA F18 | 2018/06/24 14:00 | Alejandro H Franco v Mostardi, Nico | 6-2,3-6,6-7 |
| ITF USA F38 | 2017/11/21 17:30 | Mostardi, Nico v Wolf, Jeffrey John | 2-6,2-6 |
| UTR Pro Tennis Series Florida | 2020/12/14 22:00 | Nick Chappell v Evan Bynoe | 6-1,6-1 |
| ITF M15 Santo Domingo | 2020/12/12 14:55 | Nick Chappell v Nick Hardt | 3-6,2-6 |
| ITF M15 Santo Domingo | 2020/12/11 13:30 | Nick Chappell v Ezekiel Clark | 6-3,2-6,6-1 |
| ITF M15 Santo Domingo | 2020/12/10 13:30 | Nick Chappell v Stalder, Reese | 6-4,7-6 |
| ITF M15 Santo Domingo | 2020/12/09 13:30 | Nick Chappell v Volfson, David | 6-1,6-1 |
| ITF M15 Santo Domingo | 2020/12/05 14:30 | Nick Chappell v Oliver Crawford | 5-7,6-0,4-6 |
| ITF M15 Santo Domingo | 2020/12/04 14:45 | Nick Chappell v Telles, Leonardo | 6-4,7-5 |
| ITF M15 Santo Domingo | 2020/12/03 15:55 | Nick Chappell v Jesse Flores | 6-3,7-6 |