 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) | dettagli | 18.08.2023 |
| Quarter-finals | Horak O./Siniakov D. | Bielinskyi V./Westphal M. | 2:0 (7:5, 6:4) | dettagli | 17.08.2023 |
| 1/8-finals | Horak O./Siniakov D. | Alosha Ushakov N./Mashtakov N. | 2:0 (6:3, 6:3) | dettagli | 15.08.2023 |
 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) | dettagli | 20.07.2023 |
 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) | dettagli | 01.06.2023 |
| 1/8-finals | Horak O./Siniakov D. | Cizek J./Facek J. | 2:0 (7:5, 6:2) | dettagli | 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) | dettagli | 27.05.2023 |
| Semi-finals | Horak O./Siniakov D. | Babic Z./Hermans M. | 2:1 (7:64, 2:6, 10:5) | dettagli | 26.05.2023 |
| Quarter-finals | Horak O./Siniakov D. | Karol M./Stodder T. | 2:1 (3:6, 6:3, 10:8) | dettagli | 25.05.2023 |
| 1/8-finals | Cizek J./Postolka R. | Horak O./Siniakov D. | 0:2 (4:6, 4:6) | dettagli | 23.05.2023 |
| Austria: M25 Telfs - Doubles - Main |
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| Final | Horak O./Siniakov D. | Kopp S./Veldheer M. | 0:2 (4:6, 3:6) | dettagli | 16.07.2022 |
| Semi-finals | Kivattsev K./Motti A. | Horak O./Siniakov D. | 1:2 (2:6, 6:4, 11:13) | dettagli | 15.07.2022 |
| Quarter-finals | Gloeckler M./Waldner N. | Horak O./Siniakov D. | 0:2 (4:6, 4:6) | dettagli | 14.07.2022 |
| 1/8-finals | Tomic D./Zimmermann . D. | Horak O./Siniakov D. | 0:2 (67:7, 2:6) | dettagli | 12.07.2022 |
| Czech Republic: M25 Prague 2 - Doubles - Main |
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| Quarter-finals | Johnson L./Paul J. | Horak O./Siniakov D. | 2:1 (615:7, 6:4, 10:8) | dettagli | 07.10.2021 |
| 1/8-finals | Dubrivnyy A./Kalenichenko D. | Horak O./Siniakov D. | 0:2 (3:6, 64:7) | dettagli | 06.10.2021 |
| Czech Republic: M25 Pardubice - Doubles - Main |
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| 1/8-finals | Duda F./Pavlasek A. | Horak O./Siniakov D. | 2:0 (6:3, 6:3) | dettagli | 21.09.2021 |
| Czech Republic: M25 Ricany - Doubles - Main |
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| 1/8-finals | Horak O./Siniakov D. | Kodat T./Pavlasek A. | 0:2 (4:6, 5:7) | dettagli | 31.08.2021 |
