Stadium: Court 1 Round: 14 Ground: Clay
| Challenger Pozoblanco | 2021/07/20 17:10 | Viola, Matteo v Bellucci, Thomaz | 6-1,6-3 |
| Challenger Amersfoort | 2021/07/13 10:30 | Bellucci, Thomaz v Facundo Mena | 3-6,4-6 |
| ITF M15 Champaign | 2021/06/24 14:55 | Seelig, Kyle v Bellucci, Thomaz | 2-6,6-2,6-4 |
| ITF M15 Champaign | 2021/06/23 21:50 | Smith, Roy v Bellucci, Thomaz | 6-7,3-6 |
| Tulsa, Singles Main, M-ITF-USA-16A | 2021/06/16 00:45 | Genaro Alberto Olivieri v Bellucci, Thomaz | 6-3,7-5 |
| Challenger - Ostrava | 2021/04/25 12:40 | Oscar Otte v Bellucci, Thomaz | 6-4,6-3 |
| Challenger - Tallahassee | 2021/04/19 18:35 | Torpegaard, Mikael v Bellucci, Thomaz | 7-6,7-5 |
| Orlando, USA | 2021/04/12 14:00 | Aragone, JC v Bellucci, Thomaz | 6-3,7-6 |
| ITF M25 Kottingbrunn | 2021/07/22 08:00 | Mate Valkusz v David Poljak | 6-7,7-5,7-5 |
| ITF M25 Kottingbrunn | 2021/07/20 12:10 | Niklas Waldner v David Poljak | 7-6,2-6,6-7 |
| Iasi, Romania | 2021/07/13 12:15 | Zdenek Kolar v David Poljak | 6-2,7-5 |
| Iasi, Romania | 2021/07/12 08:00 | Vlad Andrei Dancu v David Poljak | 2-6,0-6 |
| Iasi, Romania | 2021/07/11 09:20 | Mircea-Alexandru Jecan v David Poljak | 4-6,0-6 |
| ITF M25 Wroclaw | 2021/06/29 13:25 | Ignatik, Uladzimir v David Poljak | 6-0,6-2 |
| ITF M15 Bergamo | 2021/06/22 15:50 | David Poljak v Dali Blanch | 2-6,6-3,3-6 |
| Challenger - Prostejov | 2021/06/15 09:35 | Alex Molcan v David Poljak | 6-3,6-3 |