| Challenger de Las Vegas | 10/25 19:40 | 25 | [444] Tennys Sandgren v Sebastian Fanselow [300] | 3-6,7-5,6-3 | |
| Challenger de Fairfield | 10/11 16:30 | 25 | [293] Sebastian Fanselow v Tennys Sandgren [435] | 4-6,6-7 | |
| Challenger Tiburón | 10/04 20:05 | 25 | [283] Sebastian Fanselow v Alexis Galarneau [243] | 5-7,6-4,3-6 | |
| Challenger de Charleston | 09/26 18:30 | 25 | [281] Sebastian Fanselow v Ethan Quinn [489] | 6-4,3-6,3-6 | |
| ATP San Diego | 09/17 22:20 | 14 | [388] Marek Gengel v Sebastian Fanselow [281] | 6-2,3-6,6-0 | |
| Challenger de Toulouse | 08/30 08:00 | 25 | Gianluca Mager v Sebastian Fanselow | Cancelled | |
| Challenger de Banja Luka | 08/23 13:55 | 25 | [275] Sebastian Fanselow v Fabian Marozsan [239] | 4-6,3-6 | |
| Challenger de Liberec | 08/01 10:00 | 19 | [277] Sebastian Fanselow v Petr Nouza [439] | 6-4,3-6,6-7 | |
| Challenger de Liberec | 07/31 12:10 | 14 | [301] Sebastian Fanselow v Daniel Rincon [452] | 7-6,4-6,6-4 | |
| ITF M25 Esch/Alzette | 07/24 12:55 | 29 | [254] Pol M Tiffon v Sebastian Fanselow [325] | 6-2,6-0 | |
| ITF M25 Esch/Alzette | 07/23 11:55 | 28 | [325] Sebastian Fanselow v Yshai Oliel [335] | 6-1,1-6,6-3 | |
| ITF M25 Esch/Alzette | 07/22 10:20 | 27 | Chris Rodesch v Sebastian Fanselow | 6-4,6-7,4-6 | |
| ITF M25 Esch/Alzette | 07/21 11:15 | 26 | Timo Legout v Sebastian Fanselow | 7-6,6-7,5-7 | |
| ITF M25 Esch/Alzette | 07/20 10:20 | 25 | Eliakim Coulibaly v Sebastian Fanselow | 7-6,2-6,3-6 | |
| ITF M25 Kassel | 07/17 11:00 | 29 | [321] Sebastian Fanselow v Michael Vrbensky [465] | 5-7,7-6,2-6 | |
| ITF M25 Kassel | 07/16 11:25 | 28 | Sebastian Fanselow v Aleksandre Metreveli | 6-2,6-4 | |
| ITF M25 Kassel | 07/15 10:00 | 27 | [483] Rudolf Molleker v Sebastian Fanselow [321] | 1-6,6-4,3-6 | |
| ITF M25 Kassel | 07/14 08:55 | 26 | Jan Choinski v Sebastian Fanselow | 3-6,2-6 | |
| ITF M25 Kassel | 07/13 13:05 | 25 | Milan Welte v Sebastian Fanselow | 3-6,6-4,2-6 | |
| Challenger de Troyes | 06/28 08:30 | 25 | [321] Sebastian Fanselow v Filip C Jianu [315] | 2-6,4-6 | |
| Challenger de Oeiras | 06/21 13:20 | 25 | [348] Steven Diez v Sebastian Fanselow [309] | 2-6,6-1,6-4 | |
| Challenger de Parma | 06/12 15:35 | 14 | [373] Ernests Gulbis v Sebastian Fanselow [315] | 6-2,6-4 | |
| Challenger Orlando | 06/07 18:15 | 25 | [315] Sebastian Fanselow v Nicolas Mejia [292] | 2-6,6-7 | |
| Challenger de Little Rock | 05/30 19:55 | 25 | [315] Sebastian Fanselow v Yasutaka Uchiyama [294] | 6-4,3-6,1-6 | |
| Challenger de Shymkent | 05/18 05:35 | 26 | Sergey Fomin v Sebastian Fanselow | 6-3,6-3 | |
| Challenger de Shymkent | 05/17 05:55 | 25 | [318] Sebastian Fanselow v Denis Istomin [303] | 6-1,6-4 | |
| Challenger de Shymkent | 05/14 05:00 | 29 | [358] Emilio Nava v Sebastian Fanselow [397] | 6-4,7-6 | |
| Challenger de Shymkent | 05/13 04:30 | 28 | [329] Ergi Kirkin v Sebastian Fanselow [397] | 6-7,4-6 | |
| Challenger de Shymkent | 05/12 05:50 | 27 | Sebastian Fanselow v Dragos Nicolae Madaras | 6-4,7-6 | |
| Challenger de Shymkent | 05/11 05:55 | 26 | [397] Sebastian Fanselow v Antoine Bellier [311] | 3-6,6-1,6-2 |