Estádio: Court 1 Round: 14 Ground: Clay
| Challenger - Pozoblanco | 2021/07/20 17:10 | Matteo Viola v Thomaz Bellucci | 6-1,6-3 |
| Challenger - Amersfoort | 2021/07/13 10:30 | Thomaz Bellucci v Facundo Mena | 3-6,4-6 |
| ITF - M15 Champaign | 2021/06/24 14:55 | Kyle Seelig v Thomaz Bellucci | 2-6,6-2,6-4 |
| ITF - M15 Champaign | 2021/06/23 21:50 | Roy Smith v Thomaz Bellucci | 6-7,3-6 |
| ITF - M25 Tulsa | 2021/06/16 00:45 | Genaro Alberto Olivieri v Thomaz Bellucci | 6-3,7-5 |
| Challenger - Ostrava | 2021/04/25 12:40 | Oscar Otte v Thomaz Bellucci | 6-4,6-3 |
| Challenger - Tallahassee | 2021/04/19 18:35 | Mikael Torpegaard v Thomaz Bellucci | 7-6,7-5 |
| Challenger - Orlando | 2021/04/12 14:00 | JC Aragone v Thomaz Bellucci | 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 |
| Challenger Iasi | 2021/07/13 12:15 | Zdenek Kolar v David Poljak | 6-2,7-5 |
| Challenger Iasi | 2021/07/12 08:00 | Vlad Andrei Dancu v David Poljak | 2-6,0-6 |
| Challenger Iasi | 2021/07/11 09:20 | Mircea-Alexandru Jecan v David Poljak | 4-6,0-6 |
| ITF - M25 Wrocław | 2021/06/29 13:25 | Uladzimir Ignatik v David Poljak | 6-0,6-2 |
| ITF - M15 Bérgamo | 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 |