Stadium: Court 1 Round: 54 Ground: Hardcourt indoor
| ITF M15 East Lansing | 2021/11/15 18:00 | Matthew Dellavedova v John Mercer | 6-7,2-6 |
| ITF M25 Fayetteville | 2019/10/22 14:45 | Murphy Cassone v John Mercer | 6-3,2-6,10-8 |
| ITF M25 Fayetteville | 2019/10/21 15:00 | John Mercer v Ian Chadwell | 6-4,6-4 |
| ITF M15 Pittsburgh | 2019/07/01 14:00 | John Mercer v Andrew Zhang | 2-6,1-6 |
| ITF USA F33 | 2018/11/18 16:05 | Tim Ruehl v John Mercer | 6-3,6-0 |
| ITF USA F29 | 2018/10/26 18:00 | Alejandro Valencia v John Mercer | 6-4,7-5 |
| ITF USA F18 | 2018/06/25 14:00 | Jordi Arconada v John Mercer | 6-4,6-1 |
| ITF USA F18 | 2018/06/24 14:00 | Rico Gore v John Mercer | 1-6,1-6 |
| ITF M15 East Lansing | 2021/11/15 18:00 | Borja Miralles v Nico Mostardi | 6-3,2-6,4-10 |
| ITF M15 Ithaca | 2021/11/05 14:00 | Luke Johnson v Nico Mostardi | 6-0,6-0 |
| ITF M15 Ithaca | 2021/11/04 14:00 | Nico Mostardi v Guy Orly Iradukunda | 6-3,3-6,6-4 |
| ITF M15 Ithaca | 2021/11/03 14:00 | Nico Mostardi v Credit Chaiyarin | 6-4,6-2 |
| ITF M15 Ithaca | 2021/11/02 14:30 | Nico Mostardi v Alexandre Leblanc | 7-6,4-6,7-10 |
| ITF M15 Ithaca | 2021/10/06 16:35 | Nico Mostardi v Charles Broom | 1-6,6-7 |
| UTR Pro Tennis Series Dallas | 2021/08/08 15:30 | Evan Zhu v Nico Mostardi | 6-4,5-0 |
| UTR Pro Tennis Series Dallas | 2021/08/07 13:00 | Wyatt DeMulling v Nico Mostardi | 5-7,5-6 |