Stadium: Court 1 Round: 25 Ground: Clay
| UTR Pro Tennis Series Bucharest | 2021/06/04 10:00 | Oscar Jose Gutierrez v Kuzey Cekirge | 6-3,6-2 |
| ITF M25 Santander | 2021/08/23 11:20 | Kuzey Cekirge v Rafael Mazon-Hernandez | 6-1,6-0 |
| ITF M25 Santander | 2021/08/22 11:30 | Kuzey Cekirge v Ilya Rudiukov | 6-4,6-0 |
| UTR Pro Tennis Series Barcelona | 2021/08/14 09:30 | Alejandro Mendoza v Kuzey Cekirge | 6-2,6-1 |
| UTR Pro Tennis Series Barcelona | 2021/08/13 09:30 | Kuzey Cekirge v Jordi Mas De Ugarte | 4-6,0-6 |
| UTR Pro Tennis Series Barcelona | 2021/08/12 07:00 | Kuzey Cekirge v Jay Friend | 4-6,7-5,6-3 |
| UTR Pro Tennis Series Barcelona | 2021/08/11 08:30 | Pablo Carretero v Kuzey Cekirge | 4-6,6-0,6-0 |
| UTR Pro Tennis Series Barcelona | 2021/08/10 11:30 | Miguel Fernando Pereira v Kuzey Cekirge | 6-3,5-0 |
| UTR Pro Tennis Series Barcelona | 2021/08/08 08:30 | Kuzey Cekirge v Adria Soriano Barrera | 6-7,5-7 |
| ITF M25 Muttenz | 2021/08/20 11:00 | Jerome Kym v Oscar Jose Gutierrez | 4-6,6-2,6-3 |
| ITF M25 Muttenz | 2021/08/19 10:35 | Luca Castelnuovo v Oscar Jose Gutierrez | 1-6,2-6 |
| ITF M25 Muttenz | 2021/08/17 14:10 | Mateus Alves v Oscar Jose Gutierrez | 3-6,6-2,1-6 |
| Challenger San Marino | 2021/08/08 12:50 | Orlando Luz v Oscar Jose Gutierrez | 7-5,6-3 |
| ITF M25 Bolzano | 2021/08/03 18:35 | Arthur Reymond v Oscar Jose Gutierrez | 6-4,3-6,6-2 |
| Challenger Tampere | 2021/07/19 09:00 | Geoffrey Blancaneaux v Oscar Jose Gutierrez | 6-4,6-2 |
| Challenger Tampere | 2021/07/18 08:00 | Roni Rikkonen v Oscar Jose Gutierrez | 2-6,5-7 |
| ATP Bastad | 2021/07/11 09:00 | Arthur Rinderknech v Oscar Jose Gutierrez | 6-4,7-5 |