Stadium: Court C Round: 25 Ground: Clay
| ITF M25 Grodzisk Mazowiecki | 2021/08/04 15:30 | Robert Rumler v Shintaro Mochizuki | 6-3,3-6,2-6 |
| ITF M25 Grodzisk Mazowiecki | 2021/08/02 14:10 | Robert Rumler v Piotr Galus | 7-5,7-6 |
| UTR Pro Tennis Series Copenhagen | 2021/06/14 08:00 | Robert Rumler v Sebastian Grundtvig Jorgensen | 0-0 |
| ITF M25 Prague | 2021/05/10 08:00 | Robert Rumler v Robin Stanek | 0-6,3-6 |
| ITF M25 Prague | 2021/05/09 07:30 | Marco Furlanetto v Robert Rumler | 6-7,6-1,7-10 |
| ITF M15 Olomouc | 2019/10/17 07:55 | Petr Nouza v Robert Rumler | 6-7,6-4,6-4 |
| ITF M15 Olomouc | 2019/10/16 09:20 | Robert Rumler v Karlo Cubelic | 4-6,6-4,6-1 |
| ITF M15 Olomouc | 2019/10/15 08:00 | Bernardo A P E Oliveira v Robert Rumler | 2-6,2-6 |
| Challenger Segovia | 2021/07/25 14:00 | Luca Vanni v Nick Chappell | 6-1,6-2 |
| Challenger Nur-Sultan | 2021/07/23 05:00 | Oleksii Krutykh v Nick Chappell | 3-6,6-3,7-5 |
| Challenger Nur-Sultan | 2021/07/21 06:30 | Nick Chappell v Sergiy Stakhovsky | 7-6,6-4 |
| Challenger Nur-Sultan | 2021/07/19 07:05 | Grigoriy Lomakin v Nick Chappell | 3-6,6-7 |
| Challenger Nur-Sultan | 2021/07/12 08:45 | Beibit Zhukayev v Nick Chappell | 4-6,6-3,7-6 |
| ITF M25 Nur-Sultan | 2021/07/07 05:10 | Sanjar Fayziev v Nick Chappell | 6-4,6-4 |
| ITF M25 Bakio | 2021/06/30 10:00 | Antoine Bellier v Nick Chappell | 3-6,6-4,6-4 |
| ATP Eastbourne | 2021/06/19 15:45 | Nick Chappell v Mikhail Kukushkin | 2-6,3-6 |