Stadium: Court 2 Round: 44 Ground: Clay
| ITF M25 Budapest | 2021/09/27 14:25 | Mark Havlicek v Horst Rieder | 6-4,6-2 |
| ITF M15 Vyshkovo | 2021/09/20 07:00 | Horst Rieder v Danylo Veremeychuk | 6-2,1-6,5-10 |
| ITF M15 Vyshkovo | 2021/09/20 06:00 | Horst Rieder v Oleksiy Kalynyuk | 6-3,6-0 |
| ITF M15 Ulcinj | 2021/09/06 07:30 | Gabriele Piraino v Horst Rieder | 7-6,6-1 |
| ITF M15 Ulcinj | 2021/08/29 12:30 | Lautaro Agustin Falabella v Horst Rieder | 6-3,2-6,10-7 |
| ITF M25 Bolzano | 2021/08/02 14:25 | Horst Rieder v Dominique Graf | 6-7,3-6 |
| ITF M25 Bolzano | 2021/08/01 07:30 | Horst Rieder v Gabriele Camilli | 6-1,7-6 |
| ITF M25 Ricany | 2019/09/22 09:00 | Michael Paty v Horst Rieder | 2-6,4-6 |
| ITF M15 Frascati | 2022/06/09 09:40 | Franco Emanuel Egea v Niccolo Ciavarella | 6-0,6-2 |
| ITF M15 Frascati | 2022/06/07 13:55 | Daniele Minighini v Niccolo Ciavarella | 3-6,3-6 |