Stadium: Court 1 Round: 25 Ground: Clay
| Challenger Banja Luka | 2021/09/07 14:30 | Danilo Petrovic v Marko Topo | 6-4,6-7,2-6 |
| US Open | 2021/08/24 15:00 | Danilo Petrovic v Jurij Rodionov | 4-6,3-6 |
| ATP Hamburg | 2021/07/10 09:00 | Daniel Masur v Danilo Petrovic | 2-6,6-4,6-3 |
| Challenger Salzburg | 2021/07/08 09:00 | Danilo Petrovic v Pablo Cuevas | 1-6,4-6 |
| Challenger Salzburg | 2021/07/06 12:20 | Ernests Gulbis v Danilo Petrovic | 2-6,6-7 |
| Wimbledon | 2021/06/22 12:40 | Danilo Petrovic v Felix Gill | 5-7,6-7 |
| French Open | 2021/05/26 12:30 | Danilo Petrovic v Oscar Otte | 1-6,5-7 |
| French Open | 2021/05/25 08:30 | Mitchell Krueger v Danilo Petrovic | 6-3,3-6,2-6 |
| Challenger Szczecin | 2021/09/13 09:00 | Jesper De Jong v Alex Rybakov | 6-3,3-6,2-6 |
| Challenger Szczecin | 2021/09/12 09:00 | Szymon Kielan v Alex Rybakov | 2-6,6-2,3-6 |
| Challenger Kyiv | 2021/09/09 08:00 | Sebastian Baez v Alex Rybakov | 6-4,6-2 |
| Challenger Kyiv | 2021/09/07 07:00 | Alex Rybakov v Mohamed Aziz Dougaz | 5-7,6-0,6-3 |
| Challenger Kyiv | 2021/09/06 08:00 | Alex Rybakov v Aleksandr Braynin | 6-3,6-4 |
| Challenger Kyiv | 2021/09/05 08:00 | Alex Rybakov v Nikita Mashtakov | 6-2,6-2 |
| Challenger Praga | 2021/08/25 12:25 | Michael Geerts v Alex Rybakov | 6-2,6-2 |
| Challenger Praga | 2021/08/24 10:15 | Johannes Haerteis v Alex Rybakov | 4-6,2-6 |