Stadium: Court 3 Round: 25 Ground: Clay
| ITF M15 Esch/Alzette | 2021/07/19 08:55 | Marlon Vankan v Adrian Oetzbach | 6-3,6-7,10-6 |
| ITF M15 Esch/Alzette | 2021/07/18 10:20 | Marlon Vankan v Christophe Tholl | 6-4,6-1 |
| ITF M15 Troisdorf | 2021/05/13 11:45 | Louis Wessels v Marlon Vankan | 4-6,6-2,7-6 |
| ITF M15 Troisdorf | 2021/05/12 10:10 | Marlon Vankan v Alexander Mannapov | 6-2,6-1 |
| ITF M15 Troisdorf | 2021/05/11 08:00 | Glenn Smits v Marlon Vankan | 3-6,6-4,10-8 |
| ITF M15 Troisdorf | 2021/05/10 09:30 | Marlon Vankan v Yan Sabanin | 3-6,7-6,10-5 |
| ITF M15 Troisdorf | 2021/05/09 08:00 | Marlon Vankan v Niklas Schell | 2-6,7-6,13-11 |
| ITF M25 Meerbusch | 2021/04/12 07:30 | Hazem Naw v Marlon Vankan | 6-0,4-6,10-4 |
| 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 |