| ITF - East Lansing M15 | 2021/11/18 18:00 | Raymond Sarmiento v Shunsuke Mitsui | 4-6,6-2,7-6 |
| ITF - East Lansing M15 | 2021/11/17 17:55 | Joshua Peck v Shunsuke Mitsui | 6-0,4-6,5-7 |
| ITF - East Lansing M15 | 2021/11/16 15:00 | Shunsuke Mitsui v Adit Sinha | 6-2,6-4 |
| ITF - Monastir M15 | 2021/05/11 11:30 | Shunsuke Mitsui v Jeremy Beale | 6-7,6-4,2-6 |
| ITF - Monastir M15 | 2021/05/02 08:00 | Shunsuke Mitsui v Yuta Kikuchi | 1-6,2-6 |
| ITF - Monastir M15 | 2021/04/26 09:00 | Zachary Svajda v Shunsuke Mitsui | 6-1,7-6 |
| ITF - Antalya M15 | 2021/04/23 09:05 | Francesco Forti v Shunsuke Mitsui | 4-6,6-3,6-3 |
| ITF - Antalya M15 | 2021/04/22 10:15 | Shunsuke Mitsui v Bogdan Bobrov | 1-6,7-6,6-0 |
| ITF - East Lansing M15 | 2021/11/16 15:00 | John Mercer v Nico Mostardi | 1-6,5-7 |
| ITF - East Lansing M15 | 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 - Pittsburgh M15 | 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 |