| 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 |
| ITF USA F38 | 2017/11/19 16:30 | Dunbar, Jacob v Mostardi, Nico | 6-0,6-4 |
| ITF - M25 Naples | 2019/11/17 14:00 | Oliver Crawford v Johnson, Janmagnus | 7-6,6-1 |
| Orlando, Singles M-ITF-USA-38B | 2019/11/11 15:00 | Johnson, Janmagnus v Alejandro Moro Canas | 3-6,4-6 |
| ITF - M25 Naples | 2019/10/28 21:00 | Johnson, Janmagnus v Labrador, Daniel | 2-6,6-7 |
| ITF - M25 Naples | 2019/10/27 14:00 | Johnson, Janmagnus v Emmett Ward | 6-1,6-2 |
| ITF M25 Memphis | 2019/08/14 16:30 | Sarkissian, Alexander v Johnson, Janmagnus | 6-2,6-3 |
| ITF M25 Edwardsville | 2019/08/07 22:50 | Johnson, Janmagnus v Caruana, Liam | 0-6,1-6 |
| ITF M25 Edwardsville | 2019/08/06 14:00 | Johnson, Janmagnus v Frye, Bradley | 6-3,6-4 |
| ITF M25 Edwardsville | 2019/08/05 14:00 | Chamdani, Adrian v Johnson, Janmagnus | 7-5,3-6,4-10 |