| UTR Pro Tennis Series Florida | 2021/12/13 16:50 | Steven Forman v Matthew Segura | 6-2,6-0 |
| UTR Pro Tennis Series Florida | 2021/12/13 17:00 | Shunsuke Mitsui v John Mercer | 6-1,6-0 |
| ITF M15 East Lansing | 2021/11/18 18:00 | Raymond Sarmiento v Shunsuke Mitsui | 4-6,6-2,7-6 |
| ITF M15 East Lansing | 2021/11/17 17:55 | Joshua Peck v Shunsuke Mitsui | 6-0,4-6,5-7 |
| ITF M15 East Lansing | 2021/11/16 15:00 | Shunsuke Mitsui v Adit Sinha | 6-2,6-4 |
| ITF M15 Monastir | 2021/05/11 11:30 | Shunsuke Mitsui v Jeremy Beale | 6-7,6-4,2-6 |
| ITF M15 Monastir | 2021/05/02 08:00 | Shunsuke Mitsui v Yuta Kikuchi | 1-6,2-6 |
| ITF M15 Monastir | 2021/04/26 09:00 | Zachary Svajda v Shunsuke Mitsui | 6-1,7-6 |
| ITF M15 Antalya | 2021/04/23 09:05 | Francesco Forti v Shunsuke Mitsui | 4-6,6-3,6-3 |