Stadium: Court 20 Round: 26 Ground: Clay
| ITF - M15 Antalya | 2021/06/01 10:00 | Okala, Jules v Rondoni, Pietro | 6-7,4-6 |
| Challenger Biella | 2021/05/02 13:10 | Guido Andreozzi v Rondoni, Pietro | 6-2,6-2 |
| ITF M25 Meerbusch | 2021/04/14 12:15 | Milan Welte v Rondoni, Pietro | 6-3,4-6,6-4 |
| ITF M25 Meerbusch | 2021/04/13 11:00 | Rondoni, Pietro v Yvo Panak | 6-7,6-3,10-2 |
| ITF M25 Meerbusch | 2021/04/12 11:30 | Rondoni, Pietro v Dietel, Maximilian | 6-2,6-3 |
| ITF M25 Meerbusch | 2021/04/11 14:00 | Rondoni, Pietro v Sascha Moeller | 6-2,6-1 |
| ITF - M15 Opatija | 2021/03/26 11:10 | Giovanni Fonio v Rondoni, Pietro | 6-3,6-3 |
| ITF - M15 Opatija | 2021/03/25 12:15 | Rondoni, Pietro v Timo Legout | 6-1,3-6,6-2 |
| ITF - M15 Antalya | 2021/06/02 09:20 | Daisuke Sumizawa v Santiago De La Fuente | 5-7,7-5,7-5 |
| ITF - M15 Antalya | 2021/06/01 07:00 | Daisuke Sumizawa v Nicolas Parizzia | 4-6,6-1,6-10 |
| ITF - M15 Antalya | 2021/05/31 07:30 | Daisuke Sumizawa v Sengul, Bora | 6-1,7-6 |
| ITF - M15 Antalya | 2021/05/23 07:30 | Daisuke Sumizawa v Pereira, Miguel Fernando | 4-6,1-6 |
| ITF - M15 Antalya | 2021/05/18 07:00 | Mariano Navone v Daisuke Sumizawa | 6-3,6-1 |
| ITF - M15 Antalya | 2021/05/17 07:00 | Dmitrii Vasilev v Daisuke Sumizawa | 6-7,4-6 |
| ITF - M15 Antalya | 2021/05/16 07:00 | Sebastian Bahamondes v Daisuke Sumizawa | 1-6,1-6 |
| ITF - M15 Antalya | 2021/05/09 07:00 | Daisuke Sumizawa v Ignacio Carou | 6-2,1-6,8-10 |