Stadium: Court 7 Round: 25 Ground: Clay
| ITF M15 Sharm El Sheikh | 2022/02/20 12:00 | Ondrej Horak v Pieczkowski, Olaf | 1-6,5-7 |
| ITF M25 Bielsko Biala | 2023/08/14 14:00 | Ondrej Horak v 폴리토비츠, 마셀 | 6-1,6-4 |
| ITF M25 Bielsko Biala | 2023/08/14 09:00 | Ondrej Horak v 파울로브카크, 사무엘 | 6-3,6-3 |
| ITF M25 Kramsach | 2023/07/23 07:00 | Zund, Serafin v Ondrej Horak | 6-2,1-6,10-8 |
| ITF M25 Telfs | 2023/07/20 09:45 | 헬러, 페터 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 말지아리타, 마우루스 | 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 바이스, 토마스 | 4-6,4-6 |
| ITF M25 Lodz | 2023/08/10 10:30 | 파티, 다니엘 v Pieczkowski, Olaf | 6-3,6-2 |
| ITF M25 Lodz | 2023/08/09 09:20 | Karol, Milos v Pieczkowski, Olaf | 6-3,2-6,3-6 |
| ITF M25 The Hague | 2023/07/06 12:10 | 반셀보임, 에릭 v Pieczkowski, Olaf | 6-0,6-4 |
| ITF M25 The Hague | 2023/07/04 12:40 | 돈데르스, 닥스 v Pieczkowski, Olaf | 6-7,6-4,2-6 |
| ITF M15 Wroclaw | 2023/06/29 08:00 | 카바트세브, 키릴 v Pieczkowski, Olaf | 4-6,6-0,6-1 |
| ITF M15 Wroclaw | 2023/06/28 13:05 | Pieczkowski, Olaf v 두다, 필리프 | 6-2,6-2 |
| ITF M25 Poprad | 2023/06/21 09:50 | Pieczkowski, Olaf v 코다트, 토비 알렉스 | 0-6,1-6 |
| ITF M15 Litija | 2023/06/15 12:45 | Wiedenmann, Luca v Pieczkowski, Olaf | 6-3,6-0 |