stadio: Campo Centrale Round: 26 Ground: Clay
| Challenger Roma | 2021/04/27 11:30 | Daniel Masur v Cem Ilkel | 6-4,4-6,6-7 |
| Challenger Spalato | 2021/04/16 09:00 | Elias Ymer v Cem Ilkel | 6-3,6-4 |
| Challenger Spalato | 2021/04/14 10:15 | Cem Ilkel v Hugo Gaston | 2-6,6-3,7-6 |
| Challenger Spalato | 2021/04/12 13:05 | Cem Ilkel v Enzo Couacaud | 6-2,7-6 |
| Challenger Spalato | 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 San Pietroburgo | 2021/03/09 12:50 | Jack Sock v Cem Ilkel | 5-7,6-4,6-4 |
| Challenger San Pietroburgo | 2021/03/05 10:05 | Vit Kopriva v Cem Ilkel | 7-5,6-2 |
| Challenger Roma | 2021/04/27 12:25 | Lorenzo Giustino v Juan Pablo Varillas | 6-1,7-5 |
| Challenger Roma | 2021/04/23 13:05 | Lorenzo Giustino v Vit Kopriva | 6-1,5-7,3-6 |
| Challenger Roma | 2021/04/22 09:00 | Lorenzo Giustino v Sergiy Stakhovsky | 6-4,6-4 |
| Challenger Roma | 2021/04/21 09:00 | Lorenzo Giustino v Filip Horansky | 7-6,7-5 |
| Challenger Spalato | 2021/04/13 15:20 | Andrea Collarini v Lorenzo Giustino | 6-4,6-4 |
| ATP Marbella | 2021/04/05 10:00 | Henri Laaksonen v Lorenzo Giustino | 7-5,3-6,6-1 |
| ATP Marbella | 2021/04/04 10:00 | Roberto Marcora v Lorenzo Giustino | 6-7,4-6 |
| Challenger Marbella | 2021/03/30 09:00 | Mario Vilella Martinez v Lorenzo Giustino | 7-6,6-0 |