Stadium: Court 2 Round: 25 Ground: Clay
| Challenger Split | 2021/04/04 10:35 | Matteo Martineau v Matija Pecotic | 6-4,0-6,6-4 |
| Challenger Zadar | 2021/03/23 09:00 | Nikolas Sanchez Izquierdo v Matija Pecotic | 3-6,6-3,6-2 |
| Challenger Biella Qual | 2021/03/14 13:35 | Daniel Masur v Matija Pecotic | 6-0,6-3 |
| Challenger St. Petersburg | 2021/03/09 08:20 | Jiri Lehecka v Matija Pecotic | 6-2,7-6 |
| Challenger St. Petersburg | 2021/03/08 07:00 | Alessandro Bega v Matija Pecotic | 3-6,3-6 |
| Challenger St. Petersburg Qual | 2021/03/07 07:00 | Matija Pecotic v Uladzimir Ignatik | 0-6,7-6,6-4 |
| Challenger St. Petersburg | 2021/03/02 10:30 | Matija Pecotic v Andrey Kuznetsov | 6-7,2-6 |
| ITF M25 Naples | 2021/02/25 17:10 | Alejandro Gonzalez v Matija Pecotic | 6-1,7-5 |
| ITF M25 Vic | 2021/05/21 10:55 | Yan Bondarevskiy v Roberto Ortega-Olmedo | 6-3,6-3 |
| ITF M25 Vic | 2021/05/20 08:55 | Maxime Hamou v Roberto Ortega-Olmedo | 3-6,4-6 |
| Challenger Salinas 2 | 2021/04/27 17:50 | Roberto Ortega-Olmedo v Tim Van Rijthoven | 6-7,7-6,6-7 |
| Challenger Salinas | 2021/04/22 15:00 | Roberto Ortega-Olmedo v Altug Celikbilek | 6-1,4-6,4-6 |
| Challenger Salinas | 2021/04/20 15:50 | Nick Chappell v Roberto Ortega-Olmedo | 3-6,2-6 |
| Challenger Oeiras | 2021/04/05 12:30 | Carlos Gimeno Valero v Roberto Ortega-Olmedo | 6-1,6-1 |
| Challenger Oeiras | 2021/04/01 15:30 | Gastao Elias v Roberto Ortega-Olmedo | 3-6,6-1,6-3 |
| Challenger Oeiras | 2021/03/30 15:30 | Roberto Ortega-Olmedo v Ernesto Escobedo | 7-5,6-4 |