| Challenger Stockton | 09/29 18:50 | 45 | [413] Sebastian Fanselow v Alexander Sarkissian [339] | 6-7,3-6 | |
| Challenger - Tiburon | 09/22 17:00 | 45 | [416] Sebastian Fanselow v Roberto Ortega-Olmedo [325] | 1-6,2-6 | |
| Challenger Meerbusch Qual | 08/12 08:00 | 46 | Yshai Oliel v Sebastian Fanselow | 6-4,6-2 | |
| Challenger Meerbusch Qual | 08/11 08:00 | 45 | [452] Javier Barranco Cosano v Sebastian Fanselow [388] | 7-5,4-6,4-6 | |
| Challenger Pullach Qual | 08/04 13:45 | 45 | [391] Andreas Haider-Maurer v Sebastian Fanselow [386] | 6-3,7-5 | |
| ITF Italy F18 | 07/13 17:20 | 28 | [477] Jelle Sels v Sebastian Fanselow [413] | 6-4,6-2 | |
| ITF Italy F18 | 07/12 11:50 | 27 | [413] Sebastian Fanselow v Matias Zukas [387] | 6-1,3-6,6-3 | |
| ITF Italy F18 | 07/11 09:30 | 26 | Sebastian Fanselow v Lorenzo Frigerio | 6-1,6-2 | |
| ITF Italy F18 | 07/10 13:05 | 25 | Sebastian Fanselow v Filippo Leonardi | 6-3,6-3 | |
| Challenger Milan Qual | 06/24 14:30 | 46 | [421] Sebastian Fanselow v Alexei Popyrin [360] | 5-7,5-7 | |
| Challenger Milan Qual | 06/23 15:05 | 45 | [370] Marcelo Tomas Barrios Vera v Sebastian Fanselow [421] | 2-6,6-1,2-6 | |
| Challenger Blois Qual | 06/18 09:00 | 54 | [370] Marcelo T B Vera v Sebastian Fanselow [421] | 6-2,6-1 | |
| Challenger Blois Qual | 06/17 11:25 | 46 | [416] Sebastian Fanselow v Jordi Samper-Montana [386] | 7-5,3-6,6-3 | |
| Challenger Blois Qual | 06/16 11:05 | 45 | Alexis Musialek v Sebastian Fanselow | 5-7,2-6 | |
| ITF Czech Republic F1 | 05/20 09:00 | 29 | Sebastian Fanselow v Peter Torebko | 7-5,6-3 | |
| ITF Czech Republic F1 | 05/19 10:40 | 28 | Michal Konecny v Sebastian Fanselow | 5-7,0-6 | |
| ITF Czech Republic F1 | 05/18 09:00 | 27 | Sebastian Fanselow v Robert Strombachs | 6-1,6-3 | |
| ITF Czech Republic F1 | 05/17 10:35 | 26 | Sebastian Fanselow v Dan Added | 6-4,7-5 | |
| ITF Czech Republic F1 | 05/15 08:00 | 25 | Sebastian Fanselow v Tomas Jirousek | 6-0,6-1 | |
| ITF USA F10 | 04/10 18:20 | 25 | Isaiah Strode v Sebastian Fanselow | 6-0,7-6 | |
| ITF USA F9 | 04/08 17:10 | 29 | Scott Griekspoor v Sebastian Fanselow | 6-7,6-4,7-5 | |
| ITF USA F9 | 04/08 15:00 | 28 | Jack Findel-Hawkins v Sebastian Fanselow | 2-6,7-6,3-6 | |
| ITF USA F9 | 04/07 18:30 | 27 | Sebastian Fanselow v Karue Sell | 7-6,6-3 | |
| ITF USA F9 | 04/05 17:20 | 26 | Sebastian Fanselow v Nicholas S. Hu | 5-7,6-3,6-1 | |
| ITF USA F9 | 04/03 15:40 | 25 | Sebastian Fanselow v Santiago F R Taverna | 7-5,6-3 | |
| ITF USA F8 Qual | 03/19 17:00 | 62 | [390] Sebastian Fanselow v Andre Goransson [451] | 6-7,6-7 | |
| ITF USA F8 Qual | 03/18 17:00 | 62 | Sebastian Fanselow v Alec Adamson | 6-2,6-2 | |
| ITF USA F8 Qual | 03/17 17:00 | 62 | Sebastian Fanselow v Edward Bourchier | 6-3,6-4 | |
| Challenger Irving | 03/14 18:25 | 25 | Sebastian Fanselow v Lukas Lacko | 4-6,3-6 | |
| Challenger Indian Wells - Kwal. | 02/25 22:00 | 46 | Mitchell Krueger v Sebastian Fanselow | 6-1,6-4 |