Stadium: COURT 3 Round: 54 Ground: Hardcourt indoor
| ITF M25 Poznan | 2021/08/26 14:15 | Felix Gill v Harry Wendelken | 6-1,6-4 |
| ITF M25 Poznan | 2021/08/25 10:00 | Harry Wendelken v Gilbert S K Junior | 3-6,6-4,6-2 |
| ITF M25 Poznan | 2021/08/24 16:10 | Harry Wendelken v Fermin Calvo Barcelo | 6-2,6-3 |
| ITF M25 Poznan | 2021/08/24 08:00 | Harry Wendelken v Jesse De Jager | 6-1,6-3 |
| ITF M25 Poznan | 2021/08/22 08:00 | Harry Wendelken v Vojtech Vlkovsky | 6-3,6-4 |
| ITF M15 Lodz | 2021/08/18 10:05 | Alejo Lorenzo Lingua Lavallen v Harry Wendelken | 6-2,4-6,6-4 |
| ITF M15 Lodz | 2021/08/16 11:30 | Harry Wendelken v Kamil Gajewski | 6-3,6-7,10-7 |
| ITF M15 Lodz | 2021/08/16 08:00 | Harry Wendelken v Mikolaj Borkowski | 6-0,6-3 |
| ITF M15 Zilina | 2021/08/30 13:00 | Eirik Groener v Peter Nad | 3-6,6-7 |
| ITF M15 Frederiksberg | 2021/08/01 10:00 | Eirik Groener v Leyton Rivera | 2-6,5-7 |
| ITF USA F35 | 2017/10/27 20:00 | Jared Pratt v Eirik Groener | 7-6,3-6,4-6 |
| ITF Finland F1 Qual | 2017/07/29 09:30 | Eirik Groener v Patrick Christopher Stenfors | 6-0,6-1 |