 Dominican Republic: M15 Santo Domingo 3 - Doubles - Main |
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| 1/8-finals | Horak O./Kamrowski M. | Asaba A./Nortey I. | 1:2 (6:3, 4:6, 7:10) | details | 14.11.2023 |
| Dominican Republic: M15 Santo Domingo 2 - Doubles - Main |
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| Quarter-finals | Horak O./Kamrowski M. | Asaba A./Ogura K. | CAN. | details | 12.11.2023 |
| 1/8-finals | Gomez Osorio A./Vlahos A. | Horak O./Kamrowski M. | 0:2 (3:6, 1:6) | details | 12.11.2023 |
 Poland: M25 Bielsko Biala - Doubles - Main |
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| Semi-finals | Barnat J./Duda F. | Horak O./Siniakov D. | 2:0 (7:5, 6:2) | details | 18.08.2023 |
| Quarter-finals | Horak O./Siniakov D. | Bielinskyi V./Westphal M. | 2:0 (7:5, 6:4) | details | 17.08.2023 |
| 1/8-finals | Horak O./Siniakov D. | Alosha Ushakov N./Mashtakov N. | 2:0 (6:3, 6:3) | details | 15.08.2023 |
 Austria: M25 Kramsach - Doubles - Main |
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| Quarter-finals | Heller P./Wehnelt K. | Horak O./Pecak S. | 2:1 (6:3, 4:6, 10:3) | details | 28.07.2023 |
| 1/8-finals | Horak O./Pecak S. | Barton H./Lusovsky M. | 2:1 (3:6, 6:3, 12:10) | details | 25.07.2023 |
| Austria: M25 Telfs - Doubles - Main |
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| 1/8-finals | Karol M./Kopp S. | Horak O./Siniakov D. | 2:0 (6:3, 6:2) | details | 20.07.2023 |
 Slovakia: M25 Poprad - Doubles - Main |
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| Semi-finals | Horak O./Pecak S. | Orlov V./Paty D. | 0:2 (1:6, 3:6) | details | 23.06.2023 |
| Quarter-finals | Horak O./Pecak S. | Karol M./Pokorny L. | 2:1 (5:7, 6:4, 10:7) | details | 22.06.2023 |
| 1/8-finals | Horak O./Pecak S. | Mashtakov N./Pieczkowski O. | 2:0 (6:4, 6:2) | details | 20.06.2023 |
 Czech Republic: M25 Jablonec nad Nisou - Doubles - Main |
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| Quarter-finals | Horak O./Siniakov D. | Babic Z./Sultanov K. | 0:2 (4:6, 63:7) | details | 01.06.2023 |
| 1/8-finals | Horak O./Siniakov D. | Cizek J./Facek J. | 2:0 (7:5, 6:2) | details | 30.05.2023 |
| Czech Republic: M25 Most - Doubles - Main |
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| Final | Parker S./Paul J. | Horak O./Siniakov D. | 2:0 (6:3, 6:2) | details | 27.05.2023 |
| Semi-finals | Horak O./Siniakov D. | Babic Z./Hermans M. | 2:1 (7:64, 2:6, 10:5) | details | 26.05.2023 |
| Quarter-finals | Horak O./Siniakov D. | Karol M./Stodder T. | 2:1 (3:6, 6:3, 10:8) | details | 25.05.2023 |
| 1/8-finals | Cizek J./Postolka R. | Horak O./Siniakov D. | 0:2 (4:6, 4:6) | details | 23.05.2023 |
| Dominican Republic: M15 Santo Domingo - Doubles - Main |
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| 1/8-finals | Foster-Estwick M./King D. | Horak O./Kamrowski M. | 2:1 (6:3, 2:6, 11:9) | details | 22.11.2022 |
 USA: M15 East Lansing, MI - Doubles - Main |
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| 1/8-finals | Caripi V./Horak O. | Kiger M./Maginley J. | 1:2 (7:5, 2:6, 8:10) | details | 15.11.2022 |
| Austria: M25 Telfs - Doubles - Main |
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| Final | Horak O./Siniakov D. | Kopp S./Veldheer M. | 0:2 (4:6, 3:6) | details | 16.07.2022 |
| Semi-finals | Kivattsev K./Motti A. | Horak O./Siniakov D. | 1:2 (2:6, 6:4, 11:13) | details | 15.07.2022 |
| Quarter-finals | Gloeckler M./Waldner N. | Horak O./Siniakov D. | 0:2 (4:6, 4:6) | details | 14.07.2022 |
| 1/8-finals | Tomic D./Zimmermann . D. | Horak O./Siniakov D. | 0:2 (67:7, 2:6) | details | 12.07.2022 |
| Slovakia: M25 Poprad - Doubles - Main |
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| 1/8-finals | De Jager J./Horak O. | Kroslak J./Puskar S. | 0:2 (3:6, 5:7) | details | 28.06.2022 |
| Czech Republic: Ostrava - Doubles - Main |
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| 1/8-finals | Horak O./Nejedly P. | Reese H./Verbeek S. | 1:2 (2:6, 6:2, 4:10) | details | 27.04.2022 |
 Egypt: M15 Sharm ElSheikh 3 - Doubles - Main |
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| 1/8-finals | Duda F./Horak O. | Hajek P./Purtseladze S. | 0:2 (5:7, 1:6) | details | 01.03.2022 |
| Egypt: M15 Sharm ElSheikh 2 - Doubles - Main |
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| 1/8-finals | Park U./Son J. H. | Hajek P./Horak O. | 2:0 (6:4, 6:3) | details | 22.02.2022 |
| Egypt: M15 Sharm ElSheikh - Doubles - Main |
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| 1/8-finals | Cloes L./Horak O. | Lin W./Lo Chien H. | 1:2 (6:3, 3:6, 7:10) | details | 15.02.2022 |
| Czech Republic: M15 Ostrava - Doubles - Main |
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| Semi-finals | Hajek P./Horak O. | Duda F./Pavlasek A. | 0:2 (3:6, 3:6) | details | 26.11.2021 |
| Quarter-finals | Hajek P./Horak O. | Mikula M./Wojcik Y. | 2:1 (2:6, 7:5, 10:5) | details | 25.11.2021 |
| 1/8-finals | Recek D./Vlkovsky V. | Hajek P./Horak O. | 0:2 (4:6, 3:6) | details | 23.11.2021 |
