| Litauen - Int. - Kval | 2019/06/06 14:00 | Vilius Bagdanavicius v Brian Holtschke | W | 0-2 |
| Litauen - Int. - Kval | 2019/06/06 08:20 | Brian Holtschke v Jack Joseph O'Brien | W | 2-0 |
| Swiss Open - Damdubbel - Kval | 2018/09/27 15:05 | Mads Christophersen v Brian Holtschke | L | 2-0 |
| Lettland - Int. | 2019/05/31 16:30 | Aram Mahmoud v Mateusz Dubowski | L | 2-0 |
| Latvia Int. Qual | 2019/05/31 06:00 | Michael Giesinger v Mateusz Dubowski | W | 0-2 |
| Latvia Int. Qual | 2019/05/30 15:00 | Tony Lindelof v Mateusz Dubowski | W | 0-2 |
| Polish Open - Kval | 2019/03/28 11:00 | Mateusz Dubowski v Antonio Li | W | 2-0 |
| Swiss Open - Damdubbel - Kval | 2019/02/27 07:00 | Mateusz Dubowski v Andreas Hoffmann | W | 2-0 |
| Swiss Open - Damdubbel - Kval | 2017/09/27 14:10 | Adi Pratama v Mateusz Dubowski | L | 2-1 |
| All England Open | 2017/08/22 10:30 | Mateusz Dubowski v Anthony Sinisuka Ginting | L | 0-2 |
| All England Open | 2017/03/14 17:00 | Jen Hao Hsu v Mateusz Dubowski | L | 2-0 |