Stadium: Court 8 Round: 27 Ground: Clay
| ITF M15 Valldoreix | 2021/05/09 14:00 | Louis Dussin v Alexander Weis | 6-3,6-1 |
| ITF M15 LPD Gran Canaria | 2021/04/29 11:55 | Alexander Weis v Eduard Esteve Lobato | 3-6,2-6 |
| ITF M15 LPD Gran Canaria | 2021/04/28 11:25 | Alexander Weis v Diego F Flores | 0-6,6-2,6-3 |
| ITF M25 Angers | 2021/04/20 10:35 | Alexander Weis v Vincent Stouff | 7-6,3-6,3-6 |
| ITF M25 Angers | 2021/04/19 10:35 | Alexander Weis v Simon Reveniau | 6-3,6-3 |
| ITF M25 Reus | 2021/04/12 07:30 | Alexander Weis v Sean Cuenin | 2-6,6-4,10-3 |
| ITF M25 Reus | 2021/04/11 10:00 | Alexander Weis v Samuel M Arjona | 7-6,5-7,10-4 |
| ITF M15 Antalya | 2021/03/31 07:00 | Alexander Weis v Daniel Michalski | 4-6,0-6 |
| ITF M15 Valldoreix | 2021/05/10 09:00 | Francisco Cabral v Ryan Nijboer | 6-1,7-5 |
| ITF M15 Valldoreix | 2021/05/09 13:00 | Matvey Minin v Ryan Nijboer | 6-7,2-6 |
| ITF M15 Majadahonda | 2021/05/03 10:45 | Emilien Voisin v Ryan Nijboer | 5-7,6-2,10-4 |
| ITF M15 Sharm El Sheikh | 2021/04/07 11:15 | Ryan Nijboer v Yuta Shimizu | 2-6,2-6 |
| ITF M15 Sharm El Sheikh | 2021/04/03 07:30 | Mattia Bellucci v Ryan Nijboer | 7-6,6-4 |
| ITF M15 Sharm El Sheikh | 2021/04/02 07:30 | Ryan Nijboer v David Poljak | 6-2,2-6,6-4 |
| ITF M15 Sharm El Sheikh | 2021/04/01 09:10 | Ryan Nijboer v Leonardo Malgaroli | 6-4,7-5 |
| ITF M15 Sharm El Sheikh | 2021/03/31 13:25 | Oscar Jose Gutierrez v Ryan Nijboer | 7-6,2-6,3-6 |