Stadium: Court 11 Round: 54 Ground: Clay
| ITF M15 - Tbilisi | 2021/05/17 06:00 | Piotr Grynkowski v Christian Sigsgaard | 3-6,3-6 |
| ITF M15 - Tbilisi | 2021/05/17 05:30 | Piotr Grynkowski v David Chelidze | 4-6,6-4,10-7 |
| ITF M15 - Cairo | 2021/04/14 12:30 | Francesco Passaro v Piotr Grynkowski | 7-5,6-1 |
| ITF M15 - Cairo | 2021/04/13 12:30 | Piotr Grynkowski v Andrea Gola | 6-3,4-6,10-2 |
| ITF M15 - Bratislava | 2021/03/09 12:00 | Piotr Grynkowski v Edward Hubner | 2-6,2-6 |
| ITF M15 - Bratislava | 2021/03/08 12:00 | Piotr Grynkowski v Tomas Balazi | 6-0,6-1 |
| ITF M15 - Bratislava | 2021/03/03 16:55 | Piotr Grynkowski v Daniel Siniakov | 3-6,6-3,1-6 |
| ITF M15 - Bratislava | 2021/03/02 09:00 | Piotr Grynkowski v Mate Voros | 6-2,6-3 |
| ITF M15 - Shymkent | 2021/05/27 05:00 | Sanjar Fayziev v Pavel Verbin | 6-0,6-2 |
| ITF M15 - Shymkent | 2021/05/26 04:00 | Pavel Verbin v Danil Ozernoy | 7-6,4-6,7-5 |
| ITF M15 - Shymkent | 2021/05/25 06:00 | Ibrokhimjon Urinov v Pavel Verbin | 6-4,4-6,4-10 |
| ITF M15 - Shymkent | 2021/05/24 08:20 | Zhanger Almashev v Pavel Verbin | 1-6,3-6 |
| ITF M15 - St Petersburg - Kval | 2021/04/11 10:15 | Egor Noskin v Pavel Verbin | 6-3,6-2 |
| ITF M15 - Kazan | 2021/03/10 11:40 | Pavel Verbin v Daniel Ibragimov | 2-6,5-7 |
| ITF M15 - Kazan | 2021/03/09 06:55 | Alexander Zgirovsky v Pavel Verbin | 6-4,6-7,6-10 |
| ITF M15 - Kazan | 2021/03/08 12:15 | Pavel Verbin v Martin Borisiouk | 6-3,6-4 |