Stadium: Court 1 Round: 54 Ground: Hardcourt outdoor
| ITF M25 Decatur | 2021/08/02 15:00 | Brymer, Gage v Montsi, Siphosothando | 6-2,2-6,7-10 |
| ITF M25 Champaign | 2021/07/29 18:45 | Peck, Joshua v Montsi, Siphosothando | 6-3,6-7,6-4 |
| ITF M25 Champaign | 2021/07/28 19:15 | Montsi, Siphosothando v Tristan Schoolkate | 6-4,6-4 |
| ITF M15 Edwardsville | 2021/07/21 18:50 | Montsi, Siphosothando v Alexander Bernard | 6-0,5-7,6-3 |
| ITF M15 Edwardsville | 2021/07/20 14:00 | Perez, Alfredo v Montsi, Siphosothando | 6-2,4-6,5-10 |
| ITF M15 Edwardsville | 2021/07/19 15:00 | Ellefsen, Nils v Montsi, Siphosothando | 2-6,2-6 |
| ITF M15 Champaign | 2021/06/24 15:00 | Pervolarakis, Michail v Montsi, Siphosothando | 4-6,6-3,6-4 |
| ITF M15 Champaign | 2021/06/23 17:10 | Montsi, Siphosothando v Victor Lilov | 6-4,6-1 |
| ITF M25 Decatur | 2021/08/02 15:00 | Griffith, William v Ezekiel Clark | 6-4,6-7,4-10 |
| ITF M15 Edwardsville | 2021/07/21 14:00 | Paul Jubb v Ezekiel Clark | 6-2,6-0 |
| ITF M15 Champaign | 2021/06/24 17:25 | Montsi, Khololwam v Ezekiel Clark | 4-6,6-4,6-1 |
| ITF M15 Champaign | 2021/06/23 20:35 | Ezekiel Clark v Jose Pereira | 7-5,6-1 |
| Tulsa, Singles Main, M-ITF-USA-16A | 2021/06/18 16:00 | Barrientos, Nicolas v Ezekiel Clark | 4-6,6-0,7-6 |
| Tulsa, Singles Main, M-ITF-USA-16A | 2021/06/17 16:15 | Tristan Schoolkate v Ezekiel Clark | 4-6,3-6 |
| Tulsa, Singles Main, M-ITF-USA-16A | 2021/06/17 01:55 | Ezekiel Clark v Nicolas Alvarez | 6-4,6-2 |
| Tulsa, Singles Main, M-ITF-USA-16A | 2021/06/15 15:50 | Noah Schachter v Ezekiel Clark | 1-6,2-6 |