Stadium: Court 6 Round: 26 Ground: Hardcourt indoor
| ITF M25 Wichita | 2021/06/12 15:00 | Patrick Kypson v Felix Corwin | 6-3,6-2 |
| ITF M25 Wichita | 2021/06/11 20:20 | Felix Corwin v Genaro Alberto Olivieri | 3-6,6-3,6-4 |
| ITF M25 Wichita | 2021/06/10 19:40 | Felix Corwin v Ezekiel Clark | 3-6,6-3,6-3 |
| ITF M25 Wichita | 2021/06/09 20:55 | Felix Corwin v Wilson Leite | 6-2,2-6,7-6 |
| ITF M15 Heraklion | 2021/05/27 08:00 | Arthur Fery v Felix Corwin | 6-1,3-6,6-2 |
| ITF M15 Heraklion | 2021/05/26 12:40 | Gianmarco Ferrari v Felix Corwin | 3-6,2-6 |
| ITF M15 Heraklion | 2021/05/20 10:25 | Felix Corwin v Dusty H. Boyer | 6-3,3-6,4-6 |
| ITF M15 Heraklion | 2021/05/18 08:00 | Felix Corwin v Kelsey Stevenson | 3-6,6-3,7-5 |
| Davis Cup | 2021/06/18 10:30 | Valentin Vacherot v Alex Knaff | 6-2,6-3 |
| Davis Cup | 2021/06/16 09:50 | Alex Knaff v Simon Carr | 3-6,2-6 |
| ITF M15 Tallahassee | 2019/12/04 20:55 | Alex Knaff v Jason Kros | 6-1,3-6,6-7 |
| ITF M15 Tabarka | 2019/05/20 13:00 | Alex Knaff v Mauro De Maio | 6-7,6-2,8-10 |
| ITF USA F35 | 2018/12/03 15:00 | Paul Oosterbaan v Alex Knaff | 7-6,6-4 |
| ITF USA F32 | 2018/11/15 16:00 | Alex Knaff v Ricardo Rodriguez-Pace | 2-6,2-6 |
| ITF Belgium F8 | 2018/08/15 09:30 | Germain Gigounon v Alex Knaff | 6-0,6-2 |
| ITF Belgium F8 | 2018/08/14 09:00 | Guillaume Dermiens v Alex Knaff | 1-6,4-6 |