 Poland: M15 Koszalin - Doubles - Main |
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| 1/8-finals | Benes M./Ostajewski J. | Sakellaridis D./Sakellaridis M. | 1:2 (6:3, 5:7, 5:10) | details | 05.09.2023 |
 Austria: M15 Vienna - Doubles - Main |
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| 1/8-finals | Lazic M./Werren P. | Ostajewski J./Overmyer K. | 2:0 (6:2, 6:3) | details | 29.08.2023 |
| Austria: M15 Warmbad Villach - Doubles - Main |
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| Quarter-finals | Ostajewski J./Schlagenhauf N. | Oradini G./Veldheer M. | 0:2 (2:6, 4:6) | details | 24.05.2023 |
 USA: M15 Naples, FL 2 - Doubles - Main |
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| 1/8-finals | Anderson M./Ostajewski J. | Bueno G./Guillen Meza A. | 0:2 (1:6, 5:7) | details | 28.02.2023 |
| USA: M15 Naples, FL - Doubles - Main |
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| 1/8-finals | Anderson M./Ostajewski J. | Altamirano C./Kirkov V. | 0:2 (1:6, 2:6) | details | 21.02.2023 |
| USA: M25 Wesley Chapel, FL - Doubles - Main |
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| 1/8-finals | Ostajewski J./Vega L. | Alvarado P./Menichella S. | 0:2 (2:6, 4:6) | details | 24.01.2023 |
| USA: M15 Boca Raton, FL - Doubles - Main |
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| 1/8-finals | Baker B./Murgett F. | Ostajewski J./Vega L. | 2:0 (6:2, 6:1) | details | 15.11.2022 |
| USA: M15 Lubbock, TX - Doubles - Main |
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| 1/8-finals | Ribero F./Stewart T. | Anderson M./Ostajewski J. | 2:0 (6:3, 6:3) | details | 21.09.2022 |
| USA: M15 Champaign, IL - Doubles - Main |
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| Quarter-finals | Heck H./Winter E. | Anderson M./Ostajewski J. | 2:0 (6:4, 6:3) | details | 16.09.2022 |
| 1/8-finals | Brown A./Stuart O. | Anderson M./Ostajewski J. | WO. | details | 13.09.2022 |
| USA: M15 Waco, TX - Doubles - Main |
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| 1/8-finals | Hernandez N./Ostajewski J. | Brown P./Maginley J. | 0:2 (4:6, 3:6) | details | 06.07.2022 |
Mexico: M15 Cancun 4 - Singles - Main