Stadium: Court Lisboa Round: 14 Ground: Clay
| ITF M15 Antalya | 2020/02/06 07:00 | Giovanni Fonio v Daniel Michalski | 4-6,6-4,6-3 |
| Challenger Braga | 2021/09/20 09:00 | Daniel Michalski v Santiago Rodriguez Taverna | 2-6,3-6 |
| Challenger Braga | 2021/09/19 09:00 | Nicolas Moreno De Alboran v Daniel Michalski | 4-6,4-6 |
| Challenger Szczecin | 2021/09/13 13:40 | Daniel Michalski v Thai-Son Kwiatkowski | 3-6,6-4,1-6 |
| Challenger Warsaw | 2021/08/25 08:00 | Daniel Michalski v Nino Serdarusic | 3-6,4-6 |
| Challenger Warsaw | 2021/08/23 09:00 | Christopher Heyman v Daniel Michalski | 5-7,3-6 |
| Challenger Warsaw | 2021/08/22 09:00 | Wojciech Marek v Daniel Michalski | 6-7,1-6 |
| ITF M15 Lodz | 2021/08/20 10:15 | Daniel Michalski v Gilbert S K Junior | 6-4,3-6,3-6 |
| ITF M15 Lodz | 2021/08/19 10:30 | Daniel Michalski v Szymon Kielan | 3-6,7-5,6-3 |
| Challenger Bucharest | 2021/09/19 07:30 | Giovanni Fonio v Oleksii Krutykh | 3-6,1-6 |
| Challenger Trieste | 2021/07/26 12:35 | Thiago Agustin Tirante v Giovanni Fonio | 6-3,6-3 |
| Challenger Trieste | 2021/07/25 11:35 | Giovanni Fonio v Julian Ocleppo | 3-6,6-4,7-5 |
| ITF M25 Kottingbrunn | 2021/07/23 10:55 | Giovanni Fonio v Mate Valkusz | 4-6,0-6 |
| ITF M25 Kottingbrunn | 2021/07/22 08:00 | Giovanni Fonio v Sandro Kopp | 6-1,7-5 |
| ITF M25 Kottingbrunn | 2021/07/21 10:15 | Giovanni Fonio v Peter Makk | 6-3,7-6 |
| Challenger Todi | 2021/07/15 17:00 | Alexander Ritschard v Giovanni Fonio | 6-3,6-4 |
| Challenger Todi | 2021/07/13 11:00 | Giovanni Fonio v Lorenzo Giustino | 6-4,6-3 |