Stadium: Court 3 Round: 44 Ground: Clay
| ITF M15 Ulcinj | 2021/09/06 07:30 | Gabriele Piraino v Rieder, Horst | 7-6,6-1 |
| ITF M15 Ulcinj | 2021/08/29 12:30 | Lautaro Agustin Falabella v Rieder, Horst | 6-3,2-6,10-7 |
| ITF M25 Bolzano | 2021/08/02 14:25 | Rieder, Horst v Dominique Graf | 6-7,3-6 |
| ITF M25 Bolzano | 2021/08/01 07:30 | Rieder, Horst v Gabriele Camilli | 6-1,7-6 |
| ITF M25 Ricany | 2019/09/22 09:00 | Paty, Michael v Rieder, Horst | 2-6,4-6 |
| ITF - M25 Santa Margherita | 2019/09/18 15:40 | Rieder, Horst v Di Nocera, Riccardo | 3-6,7-5,4-6 |
| ITF - M25 Santa Margherita | 2019/09/17 12:00 | Sudzum, Marcel Marlon v Rieder, Horst | 0-6,0-6 |
| ITF - M25 Santa Margherita | 2019/09/13 11:00 | Rieder, Horst v Wilson Leite | 1-6,1-6 |
| ITF M15 Vyshkovo | 2021/09/19 11:00 | Danylo Semenov v Oleksiy Kalynyuk | 2-6,6-0,6-10 |