Stadium: Court 4 Round: 25 Ground: Clay
| Challenger Split | 2021/04/06 10:00 | Mirza Basic v Cem Ilkel | 7-6,6-3 |
| ATP Dubai | 2021/03/13 07:00 | Christopher O'Connell v Cem Ilkel | 6-3,6-4 |
| Challenger St. Petersburg | 2021/03/09 12:50 | Jack Sock v Cem Ilkel | 5-7,6-4,6-4 |
| Challenger St. Petersburg | 2021/03/05 10:05 | Vit Kopriva v Cem Ilkel | 7-5,6-2 |
| Challenger St. Petersburg | 2021/03/03 10:30 | Dominic Stephan Stricker v Cem Ilkel | 7-6,3-6,3-6 |
| Challenger St. Petersburg | 2021/03/01 13:45 | Shuichi Sekiguchi v Cem Ilkel | 3-6,2-6 |
| Challenger Potchefstroom | 2021/02/19 10:20 | Cem Ilkel v Jenson Brooksby | 1-6,4-6 |
| Challenger Potchefstroom | 2021/02/18 08:00 | Cem Ilkel v Chun Hsin Tseng | 7-6,7-5 |
| Challenger Oeiras | 2021/04/05 14:10 | Nuno Borges v Enzo Couacaud | 6-3,6-4 |
| Challenger Oeiras | 2021/03/30 09:00 | Evan Furness v Enzo Couacaud | 6-4,3-6,7-6 |
| Challenger Zadar | 2021/03/22 12:40 | Michael Vrbensky v Enzo Couacaud | 6-3,6-2 |
| Challenger Gran Canaria | 2021/03/03 11:00 | Enzo Couacaud v Alex Molcan | 2-6,4-6 |
| Challenger Gran Canaria | 2021/03/02 10:00 | Lorenzo Giustino v Enzo Couacaud | 6-7,7-5,1-6 |
| Challenger Gran Canaria | 2021/02/28 13:00 | Steven Diez v Enzo Couacaud | 6-7,6-7 |
| Challenger Gran Canaria | 2021/02/27 12:00 | Nikola Milojevic v Enzo Couacaud | 2-6,2-6 |
| Challenger Gran Canaria | 2021/02/26 11:00 | Marco Trungelliti v Enzo Couacaud | 1-6,6-0,6-7 |