Stadium: Court 4 Round: 62 Ground: Clay
| ITF M15 Antalya | 2021/05/02 06:00 | Mick Veldheer v Gokberk Saritas | 6-3,6-3 |
| ITF M15 Antalya | 2021/04/29 07:30 | Mick Veldheer v Francesco Forti | 5-7,1-6 |
| ITF M15 Antalya | 2021/04/27 10:30 | Mick Veldheer v Jumpei Yamasaki | 4-6,6-1,6-0 |
| ITF M25 Meerbusch | 2021/04/11 12:30 | Mick Veldheer v Alessio Vasquez Gehrke | 1-6,6-0,9-11 |
| Challenger Split | 2021/04/04 09:00 | Mick Veldheer v Uladzimir Ignatik | 1-6,3-6 |
| ITF M25 Biel | 2021/03/31 10:40 | Mick Veldheer v Alexis Gautier | 4-6,0-6 |
| ITF M25 Biel | 2021/03/30 10:00 | Mick Veldheer v Jakub Paul | 6-2,4-6,10-6 |
| ITF M25 Biel | 2021/03/29 14:30 | Mick Veldheer v Jan Sebesta | 6-3,6-1 |
| ITF M15 Monastir | 2021/04/11 09:00 | Andrea Guerrieri v Lukas H Lilleengen | 7-5,7-5 |
| ITF M15 Monastir | 2021/04/05 09:00 | Fons Van Sambeek v Lukas H Lilleengen | 6-2,7-5 |
| ITF M15 Poitiers | 2021/03/14 14:05 | Raphael Baltensperger v Lukas H Lilleengen | 6-3,6-2 |
| ITF M25 Vale Do Lobo | 2021/03/08 12:00 | Edouard Villoslada v Lukas H Lilleengen | 6-4,4-6,10-8 |
| ITF M25 Vale Do Lobo | 2021/03/07 12:00 | Afonso Portugal v Lukas H Lilleengen | 2-6,2-6 |
| ITF M25 Faro | 2021/03/01 14:00 | Alexis Musialek v Lukas H Lilleengen | 6-3,6-2 |
| ITF M25 Faro | 2021/02/28 12:00 | Tiago Torres v Lukas H Lilleengen | 4-6,2-6 |
| ITF M25 Vale Do Lobo | 2021/02/24 13:30 | Max Andrews v Lukas H Lilleengen | 6-4,6-0 |