| Challenger Fairfield | 10/10 19:50 | 26 | [210] Lucas Miedler v Sebastian Fanselow [423] | 4-6,1-6 | |
| Challenger Fairfield | 10/09 17:00 | 25 | [423] Sebastian Fanselow v Cem Ilkel [234] | 6-2,5-7,6-0 | |
| Challenger Fairfield | 10/08 18:45 | 54 | [252] Mitchell Krueger v Sebastian Fanselow [423] | 0-6,2-6 | |
| Challenger Fairfield | 10/07 19:50 | 46 | [415] Sebastian Fanselow v Vivero Gonzalez, Pablo [437] | 6-4,2-6,7-5 | |
| Challenger Fairfield | 10/06 17:00 | 45 | [415] Sebastian Fanselow v Harris, Andrew [337] | 3-6,6-1,6-1 | |
| Challenger Stockton | 09/29 18:50 | 45 | [413] Sebastian Fanselow v Sarkissian, Alexander [339] | 6-7,3-6 | |
| Challenger Tiburon | 09/22 17:00 | 45 | [416] Sebastian Fanselow v Ortega-Olmedo, Roberto [325] | 1-6,2-6 | |
| Meerbusch, Allemagne, Qualifications | 08/12 08:00 | 46 | Yshai Oliel v Sebastian Fanselow | 6-4,6-2 | |
| Meerbusch, Allemagne, Qualifications | 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] Haider-Maurer, Andreas 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 Zukas, Matias [387] | 6-1,3-6,6-3 | |
| ITF Italy F18 | 07/11 09:30 | 26 | Sebastian Fanselow v Frigerio, Lorenzo | 6-1,6-2 | |
| ITF Italy F18 | 07/10 13:05 | 25 | Sebastian Fanselow v Leonardi, Filippo | 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] Barrios Vera, Marcelo Tomas v Sebastian Fanselow [421] | 6-2,6-1 | |
| Challenger Blois Qual | 06/17 11:25 | 46 | [416] Sebastian Fanselow v Samper-Montana, Jordi [386] | 7-5,3-6,6-3 | |
| Challenger Blois Qual | 06/16 11:05 | 45 | Musialek, Alexis v Sebastian Fanselow | 5-7,2-6 | |
| ITF Czech Republic F1 | 05/20 09:00 | 29 | Sebastian Fanselow v Torebko, Peter | 7-5,6-3 | |
| ITF Czech Republic F1 | 05/19 10:40 | 28 | Konecny, Michal 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 Jirousek, Tomas | 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 | Griekspoor, Scott v Sebastian Fanselow | 6-7,6-4,7-5 | |
| ITF USA F9 | 04/08 15:00 | 28 | Findel-Hawkins, Jack 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 Hu, Nicholas S | 5-7,6-3,6-1 | |
| ITF USA F9 | 04/03 15:40 | 25 | Sebastian Fanselow v Rodriguez Taverna, Santiago FA | 7-5,6-3 |