Stadium: Court 3 Round: 28 Ground: Hardcourt indoor
| ITF M15 - East Lansing | 2021/11/19 17:55 | Alex Knaff v Colin Sinclair | 7-6,5-7,6-2 |
| ITF M15 - East Lansing | 2021/11/18 20:00 | Ronald Hohmann v Alex Knaff | 3-6,4-6 |
| ITF M15 - East Lansing | 2021/11/17 18:00 | William Bushamuka v Alex Knaff | 2-6,6-7 |
| ITF M15 - East Lansing | 2021/11/16 16:00 | Joshua Sheehy v Alex Knaff | 3-6,2-6 |
| ITF M15 - Ithaca | 2021/11/04 13:55 | Felix Corwin v Alex Knaff | 5-7,7-6,7-5 |
| ITF M15 - Ithaca | 2021/11/03 15:30 | Radu Mihai Papoe v Alex Knaff | 6-4,3-6,0-6 |
| ITF M15 - Tallahassee | 2021/10/27 13:55 | Alex Knaff v Sho Shimabukuro | 4-6,6-4,4-6 |
| ITF M15 - Tallahassee | 2021/10/26 13:00 | Blu Baker v Alex Knaff | 6-7,5-7 |
| ITF M15 - East Lansing | 2021/11/19 20:55 | Gabriel Diallo v Matt Kuhar | 6-3,6-4 |
| ITF M15 - East Lansing | 2021/11/18 21:50 | Gabriel Diallo v Andres Andrade | 7-6,7-5 |
| ITF M15 - East Lansing | 2021/11/16 18:00 | Jeffrey Von Der Schulenburg v Gabriel Diallo | 1-6,2-6 |
| Challenger - Lexington | 2021/07/25 15:00 | Darian King v Gabriel Diallo | 6-2,3-6,6-3 |
| ITF M15 - Champaign | 2021/06/27 15:00 | Jason Kubler v Gabriel Diallo | 6-2,6-1 |
| ITF M15 - Champaign | 2021/06/26 15:00 | Gabriel Diallo v Kyle Seelig | 6-4,6-3 |
| ITF M15 - Champaign | 2021/06/25 17:00 | Gabriel Diallo v Khololwam Montsi | 7-5,6-3 |
| ITF M15 - Champaign | 2021/06/24 15:00 | Genaro Alberto Olivieri v Gabriel Diallo | 3-6,6-7 |