 Croatia: M15 Bol - Doubles - Main |
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| 1/8-finals | Hartig R./Tumbas Kajgo K. | Hampe S. P./Hjorth P. | 0:2 (3:6, 62:7) | details | 21.05.2024 |
| 1/8-finals | Hartig R./Tumbas Kajgo K. | Giovannini F./Pennaforti G. | CAN. | details | 21.05.2024 |
 Sweden: M25 Varnamo - Doubles - Main |
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| Semi-finals | Hartig R./Stanke C. | Durasovic V./Hellum Lilleengen L. | 0:2 (3:6, 2:6) | details | 10.05.2024 |
| Quarter-finals | Munkhammar P./Renard L. | Hartig R./Stanke C. | 0:2 (2:6, 64:7) | details | 09.05.2024 |
| 1/8-finals | Heinonen A./Jansson O. | Hartig R./Stanke C. | 0:2 (62:7, 3:6) | details | 07.05.2024 |
 Germany: M15 Meerbusch - Doubles - Main |
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| Semi-finals | Broska F./Ramskogler G. | Hartig R./Sobbe L. M. | 2:0 (6:3, 6:2) | details | 26.04.2024 |
| Quarter-finals | Hartig R./Sobbe L. M. | Sperle J./Vankan M. | 2:0 (6:4, 6:4) | details | 25.04.2024 |
| 1/8-finals | Einig F./Hornung M. | Hartig R./Sobbe L. M. | 0:2 (63:7, 2:6) | details | 23.04.2024 |
 Tunisia: M25 Hammamet 7 - Doubles - Main |
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| 1/8-finals | Tresca G./Volpi G. | Hartig R./Hornung M. | 2:0 (6:4, 6:2) | details | 16.04.2024 |
| Croatia: M15 Rovinj - Doubles - Main |
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| 1/8-finals | Hartig R./Sobbe L. M. | Bill A./Vetrih M. | 1:2 (6:4, 3:6, 9:11) | details | 12.03.2024 |
 Turkey: M15 Antalya 20 - Doubles - Main |
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| 1/8-finals | Hartig R./Zielinski M. | Bobrov B./Nesterov P. | 0:2 (1:6, 3:6) | details | 12.12.2023 |
| Tunisia: M25 Monastir 7 - Doubles - Main |
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| Quarter-finals | Corbinais S./Habib H. | Hartig R./Sobbe L. M. | 2:0 (6:2, 6:1) | details | 09.11.2023 |
| 1/8-finals | Hamza Reguig S./Lorusso L. | Hartig R./Sobbe L. M. | 0:2 (3:6, 3:6) | details | 08.11.2023 |
 Spain: M25 Zaragoza - Doubles - Main |
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| Semi-finals | Wassermann D./Wassermann M. | Brosset S./Hartig R. | WO. | details | 06.10.2023 |
| Quarter-finals | De Krom M./Nijboer R. | Brosset S./Hartig R. | WO. | details | 06.10.2023 |
| 1/8-finals | Brosset S./Hartig R. | Gimenez Sanchez E./Sanclemente Claver G. | 2:1 (63:7, 6:4, 10:8) | details | 04.10.2023 |
| Germany: M15 Buschhausen - Doubles - Main |
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| 1/8-finals | Hartig R./Loccisano M. | Hermans M./Van Tilburg R. | 1:2 (3:6, 7:5, 7:10) | details | 12.09.2023 |
 Netherlands: M25 Oldenzaal - Doubles - Main |
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| Quarter-finals | Hartig R./Sobbe L. M. | Den Heijer G./Pontjodikromo S. | 0:2 (2:6, 4:6) | details | 31.08.2023 |
| 1/8-finals | Hartig R./Sobbe L. M. | Meijer D./Wagenaar L. | 2:0 (7:64, 6:1) | details | 31.08.2023 |
 Belgium: M15 Eupen - Doubles - Main |
|---|
| Final | Bozemoj B./Pel S. | Hartig R./Sobbe L. M. | 2:0 (6:3, 6:3) | details | 12.08.2023 |
| Semi-finals | Hartig R./Sobbe L. M. | Hammond L./Hornung M. | 2:0 (7:5, 6:3) | details | 11.08.2023 |
| Quarter-finals | Hartig R./Sobbe L. M. | Garcian A./Rivet M. | 2:0 (6:1, 7:5) | details | 10.08.2023 |
| 1/8-finals | Sannen T./Stanke C. | Hartig R./Sobbe L. M. | 0:2 (63:7, 4:6) | details | 09.08.2023 |
| Germany: M25 Marburg - Doubles - Main |
|---|
| Quarter-finals | Hartig R./Sobbe L. M. | Gadamauri B./Hermans M. | 0:2 (1:6, 1:6) | details | 06.07.2023 |
| 1/8-finals | Hartig R./Sobbe L. M. | Matuszewski G./Salazar D. | 2:0 (6:3, 6:1) | details | 04.07.2023 |
| Germany: M15 Meerbusch - Doubles - Main |
|---|
| 1/8-finals | Boehler D./Larwig N. | Hartig R./Varzandeh T. | 2:0 (6:1, 6:2) | details | 25.04.2023 |
| Tunisia: M15 Monastir 8 - Doubles - Main |
|---|
| 1/8-finals | Hartig R./Nitschke T. | Bittoun C./Iannaccone F. | 0:2 (4:6, 0:6) | details | 21.02.2023 |
| Tunisia: M15 Monastir 13 - Doubles - Main |
|---|
| 1/8-finals | Hartig R./Werner E. J. | Kielan S./Pawelski M. | 0:2 (2:6, 1:6) | details | 05.04.2022 |
