Stadium: Court 7 Round: 25 Ground: Clay
| ITF M15 Sharm El Sheikh | 2022/02/20 12:00 | Ondrej Horak v Olaf Pieczkowski | 1-6,5-7 |
| ITF M25 Bielsko Biala | 2023/08/14 14:00 | Ondrej Horak v Marcel Politowicz | 6-1,6-4 |
| ITF M25 Bielsko Biala | 2023/08/14 09:00 | Ondrej Horak v Samuel Paulovcak | 6-3,6-3 |
| ITF M25 Kramsach | 2023/07/23 07:00 | Serafin Zund v Ondrej Horak | 6-2,1-6,10-8 |
| ITF M25 Telfs | 2023/07/20 09:45 | Peter Heller v Ondrej Horak | 6-1,6-1 |
| ITF M25 Telfs | 2023/07/19 11:55 | Matthias Ujvary v Ondrej Horak | 2-6,4-6 |
| ITF M25 Telfs | 2023/07/17 10:00 | Ondrej Horak v Maurus Malgiaritta | 6-3,6-4 |
| ITF M25 Telfs | 2023/07/16 13:00 | Ondrej Horak v Elias Julian Werner | 6-4,7-5 |
| ITF M25 Poprad | 2023/06/19 08:00 | Ondrej Horak v Tomas Vaise | 4-6,4-6 |
| ITF M25 Lodz | 2023/08/10 10:30 | Daniel Paty v Olaf Pieczkowski | 6-3,6-2 |
| ITF M25 Lodz | 2023/08/09 09:20 | Milos Karol v Olaf Pieczkowski | 6-3,2-6,3-6 |
| ITF M25 The Hague | 2023/07/06 12:10 | Eric Vanshelboim v Olaf Pieczkowski | 6-0,6-4 |
| ITF M25 The Hague | 2023/07/04 12:40 | Dax Donders v Olaf Pieczkowski | 6-7,6-4,2-6 |
| ITF M15 Wroclaw | 2023/06/29 08:00 | Kirill Kivattsev v Olaf Pieczkowski | 4-6,6-0,6-1 |
| ITF M15 Wroclaw | 2023/06/28 13:05 | Olaf Pieczkowski v Filip Duda | 6-2,6-2 |
| ITF M25 Poprad | 2023/06/21 09:50 | Olaf Pieczkowski v Toby Alex Kodat | 0-6,1-6 |
| ITF M15 Litija | 2023/06/15 12:45 | Luca Wiedenmann v Olaf Pieczkowski | 6-3,6-0 |