 Greece: M15 Heraklion 3 - Doubles - Main |
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| 1/8-finals | Bueno Gil A./Dinev D. | Caripi V./Hartenstein J. P. | 1:2 (6:2, 3:6, 5:10) | dettagli | 01.04.2025 |
 Switzerland: M25 Trimbach - Doubles - Main |
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| 1/8-finals | Rosenkranz M./Schell N. | Gomez G./Hartenstein J. P. | 2:0 (6:2, 6:3) | dettagli | 04.03.2025 |
 USA: M15 Palm Coast, FL - Doubles - Main |
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| Quarter-finals | Benson M./Hartenstein J. P. | Van Herck L./Vankan M. | 0:2 (4:6, 3:6) | dettagli | 30.01.2025 |
| 1/8-finals | Acioly L./Goncalves V. | Benson M./Hartenstein J. P. | 0:2 (65:7, 4:6) | dettagli | 28.01.2025 |
| Greece: M15 Heraklion 6 - Doubles - Main |
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| Quarter-finals | Hartenstein J. P./Steiner M. | Knaff A./Simakin I. | 0:2 (65:7, 4:6) | dettagli | 14.11.2024 |
| 1/8-finals | Noce G. M./Trochu P. | Hartenstein J. P./Steiner M. | 0:2 (5:7, 0:6) | dettagli | 13.11.2024 |
 Germany: M25 Kassel - Doubles - Main |
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| 1/8-finals | Agwi M./Hartenstein J. P. | Johann L./Sanchez Martinez B. | 0:2 (3:6, 66:7) | dettagli | 09.07.2024 |
 Poland: M15 Koszalin - Doubles - Main |
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| Quarter-finals | Kielan S./Pieczonka F. | De Jonge D./Hartenstein J. P. | 2:0 (6:2, 6:4) | dettagli | 14.06.2024 |
| 1/8-finals | De Jonge D./Hartenstein J. P. | Almazan Valiente I./Kokot B. | 2:0 (7:5, 7:5) | dettagli | 14.06.2024 |
 Slovakia: M25 Trnava 2 - Doubles - Main |
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| 1/8-finals | Hartenstein J. P./Postolka R. | Ingildsen J./Matusevich A. | 0:2 (1:6, 3:6) | dettagli | 07.11.2023 |
| Poland: M15 Koszalin - Doubles - Main |
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| Semi-finals | Rajski M./Wojcik Y. | Hartenstein J. P./Pavlenko P. | 2:1 (1:6, 7:5, 10:6) | dettagli | 08.09.2023 |
| Quarter-finals | Hartenstein J. P./Pavlenko P. | Sakellaridis D./Sakellaridis M. | 2:0 (6:3, 6:3) | dettagli | 07.09.2023 |
| 1/8-finals | Kielan S./Kosinski F. | Hartenstein J. P./Pavlenko P. | 0:2 (3:6, 3:6) | dettagli | 05.09.2023 |
| Poland: M15 Szczawno - Doubles - Main |
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| Quarter-finals | Hartenstein J. P./Pavlenko P. | Michalik R./Nad P. | 1:2 (2:6, 6:4, 6:10) | dettagli | 31.08.2023 |
| 1/8-finals | Nicod J./Zahraj P. | Hartenstein J. P./Pavlenko P. | 1:2 (5:7, 6:4, 6:10) | dettagli | 30.08.2023 |
| Germany: M25 Marburg - Doubles - Main |
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| Quarter-finals | Hartenstein J. P./Pavlenko P. | Recek D./Siniakov D. | 1:2 (6:2, 5:7, 3:10) | dettagli | 06.07.2023 |
| 1/8-finals | Gentzsch T./Mousley B. | Hartenstein J. P./Pavlenko P. | 0:2 (0:6, 63:7) | dettagli | 05.07.2023 |
 Denmark: M25 Risskov/Aarhus - Doubles - Main |
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| 1/8-finals | Hartenstein J. P./Pavlenko P. | Holmgren A./Sigsgaard C. | 0:2 (3:6, 63:7) | dettagli | 13.06.2023 |
| USA: M15 Orange Park, FL - Doubles - Main |
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| Semi-finals | Crespo Piedra R./Hartenstein J. P. | Ribeiro Lago E./Rodriguez R. | 0:2 (4:6, 4:6) | dettagli | 06.05.2023 |
| Quarter-finals | Andrade A./Vale D. | Crespo Piedra R./Hartenstein J. P. | 1:2 (66:7, 6:3, 8:10) | dettagli | 04.05.2023 |
| 1/8-finals | Crespo Piedra R./Hartenstein J. P. | Boitan G. A./Markes C. | 2:1 (4:6, 6:2, 10:5) | dettagli | 02.05.2023 |
| USA: M15 Boca Raton, FL - Doubles - Main |
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| Semi-finals | Hartenstein J. P./Phillips R. | Baker B./Murgett F. | 0:2 (1:6, 3:6) | dettagli | 18.11.2022 |
| Quarter-finals | Kotan P./Nesterov A. | Hartenstein J. P./Phillips R. | 0:2 (1:6, 1:6) | dettagli | 17.11.2022 |
| 1/8-finals | Hartenstein J. P./Phillips R. | Chin J./Renard L. | 2:1 (65:7, 6:2, 10:6) | dettagli | 16.11.2022 |
 Netherlands: M15 Haren - Doubles - Main |
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| 1/8-finals | Khoeblal E./Van Baal A. J. W. | Hartenstein J. P./Pavlenko P. | 2:0 (6:2, 7:66) | dettagli | 30.08.2022 |
Czech Republic: M25 Pardubice - Singles - Main
