| ITF Tunisia F1 | 01/10 12:45 | 25 | Lluis Dolz v Jeremy Jahn | 4-6,0-6 | |
| Challenger – Eckental | 10/30 15:00 | 25 | [249] Jeremy Jahn v Alexander Bublik [112] | 4-6,4-6 | |
| Challenger Ismaning | 10/18 18:15 | 26 | [248] Jeremy Jahn v Yannick Hanfmann [132] | 6-7,6-4,3-6 | |
| Challenger Ismaning | 10/17 09:50 | 25 | [248] Jeremy Jahn v Laurynas Grigelis [277] | 7-6,3-6,7-6 | |
| Challenger - Ortisei | 10/10 08:30 | 25 | [234] Viktor Galovic v Jeremy Jahn [251] | 6-3,3-6,6-3 | |
| Challenger - Sibiu | 09/18 09:00 | 25 | [118] Bjorn Fratangelo v Jeremy Jahn [221] | 2-6,6-3,7-6 | |
| Challenger Alphen | 09/07 14:00 | 26 | [175] Tommy Robredo v Jeremy Jahn [216] | 6-4,7-6 | |
| Challenger Alphen | 09/06 10:00 | 25 | [216] Jeremy Jahn v Ivan Endara [383] | 6-1,6-4 | |
| Challenger - Como | 08/30 10:10 | 26 | [216] Jeremy Jahn v Oscar Otte [140] | 4-6,6-2,3-6 | |
| Challenger - Como | 08/28 17:30 | 25 | [216] Jeremy Jahn v Steven Diez [301] | 6-1,6-2 | |
| US Open Qual | 08/23 19:10 | 44 | [112] Renzo Olivo v Jeremy Jahn [217] | 7-6,6-4 | |
| Challenger - Meerbusch | 08/18 11:30 | 27 | Karim-Mohamed Maamoun v Jeremy Jahn | 3-6,6-2,6-4 | |
| Challenger - Meerbusch | 08/17 12:35 | 26 | [253] Inigo Cervantes v Jeremy Jahn [202] | 4-6,6-7 | |
| Challenger - Meerbusch | 08/15 15:10 | 25 | [227] Federico Coria v Jeremy Jahn [202] | 6-3,0-6,4-6 | |
| ITF Italy F25 | 08/11 13:00 | 28 | [201] Jeremy Jahn v Tomislav Brkic [347] | 4-6,6-3,4-6 | |
| ITF Italy F25 | 08/11 08:00 | 27 | [201] Jeremy Jahn v Matthias Bachinger [342] | 6-3,6-2 | |
| ITF Italy F25 | 08/09 08:00 | 26 | Jeremy Jahn v Omar Giacalone | 7-5,6-3 | |
| ITF Italy F25 | 08/08 12:20 | 25 | Jeremy Jahn v Ryota Kishi | 6-3,6-2 | |
| Challenger - Liberec | 08/04 14:30 | 27 | [207] Jeremy Jahn v Ricardo Ojeda Lara [260] | 6-7,4-6 | |
| Challenger - Liberec | 08/03 10:00 | 26 | [376] Juan Pablo Ficovich v Jeremy Jahn [207] | 3-6,4-6 | |
| Challenger - Liberec | 08/01 08:30 | 25 | [237] Zdenek Kolar v Jeremy Jahn [207] | 3-6,6-4,6-7 | |
| Challenger - Praha | 07/27 10:30 | 26 | [215] Andrej Martin v Jeremy Jahn [223] | 7-5,2-6,6-4 | |
| Challenger - Praha | 07/25 15:55 | 25 | [212] Christian Garin v Jeremy Jahn [223] | Retired | |
| ITF Germany F8 | 07/22 11:10 | 28 | [232] Jeremy Jahn v Jan Choinski [483] | 5-7,2-6 | |
| ITF Germany F8 | 07/21 11:00 | 27 | Jeremy Jahn v Elmar Ejupovic | 6-1,7-5 | |
| ITF Germany F8 | 07/20 10:30 | 26 | [232] Jeremy Jahn v Maximilian Neuchrist [437] | 6-2,3-6,7-6 | |
| ITF Germany F8 | 07/19 11:00 | 25 | [232] Jeremy Jahn v Franco Agamenone [431] | 6-1,3-6,6-1 | |
| ITF Austria F2 | 07/15 12:45 | 29 | [216] Daniel Brands v Jeremy Jahn [237] | 7-6,6-1 | |
| ITF Austria F2 | 07/14 09:00 | 28 | Pascal Brunner v Jeremy Jahn | 5-7,2-6 | |
| ITF Austria F2 | 07/13 11:00 | 27 | Sebastian Prechtel v Jeremy Jahn | 4-6,0-6 |