| WTT Contender Muscat | 2022/02/27 06:00 | Kay Stumper v Licen Yuan | L | 0-3 |
| WTT Contender Tunis | 2021/10/28 14:30 | Kay Stumper v Ovidiu Ionescu | L | 0-3 |
| WTT Contender Tunis | 2021/10/27 14:00 | Yang Wang v Kay Stumper | W | 2-3 |
| Champions League | 2021/09/17 18:15 | Jiri Martinko v Kay Stumper | W | 1-3 |
| Champions League | 2021/09/16 12:30 | Thiago Monteiro v Kay Stumper | W | 0-3 |
| Champions League | 2021/09/15 13:05 | Kay Stumper v Zsolt Peto | W | 3-0 |
| Dusseldorf Masters | 2020/08/14 15:20 | Steffen Mengel v Kay Stumper | L | 4-0 |
| Dusseldorf Masters | 2020/06/08 10:00 | Steffen Mengel v Kay Stumper | L | 3-0 |
| WTT Feeder Doha | 2022/03/13 13:00 | Yuanyu Chen v Zihni Sahin | W | 3-1 |