Stadium: Court 1 Round: 26 Ground: Hardcourt indoor
| Challenger Yokohama | 2018/03/02 02:00 | Cem Ilkel v Tobias Kamke | 7-6,6-2 |
| Challenger Biel | 2021/09/21 11:25 | Cem Ilkel v Matteo Viola | 7-6,7-6 |
| Davis Cup | 2021/09/18 10:35 | Cem Ilkel v Ernests Gulbis | 6-4,6-1 |
| US Open | 2021/08/30 20:35 | Alex Molcan v Cem Ilkel | 4-6,6-3,6-1,6-1 |
| US Open | 2021/08/27 15:00 | Cem Ilkel v Jiri Lehecka | 7-6,6-3 |
| US Open | 2021/08/26 15:00 | Fernando Verdasco v Cem Ilkel | 6-4,3-6,4-6 |
| US Open | 2021/08/24 19:15 | Cedrik-Marcel Stebe v Cem Ilkel | 6-7,1-6 |
| Challenger Segovia | 2021/07/29 11:50 | Nicolas Moreno De Alboran v Cem Ilkel | 6-4,6-0 |
| Challenger Segovia | 2021/07/27 14:00 | Roberto Ortega-Olmedo v Cem Ilkel | 6-3,6-7,4-6 |
| Challenger Biel | 2021/09/20 12:45 | Tobias Kamke v Dimitar Kuzmanov | 6-4,7-6 |
| Challenger Rennes | 2021/09/14 16:45 | Tobias Kamke v Arthur Rinderknech | 3-6,6-3,3-6 |
| Challenger Mallorca | 2021/09/04 14:00 | Lukas Lacko v Tobias Kamke | 6-0,6-3 |
| Challenger Mallorca | 2021/09/03 16:00 | Tobias Kamke v Fernando Verdasco | 6-3,6-1 |
| Challenger Mallorca | 2021/09/02 14:30 | Tobias Kamke v Nick Chappell | 6-2,6-4 |
| Challenger Mallorca | 2021/09/01 16:00 | Blaz Rola v Tobias Kamke | 4-6,4-6 |
| US Open | 2021/08/24 17:05 | Tobias Kamke v Illya Marchenko | 6-3,6-7,2-6 |
| Challenger Meerbusch | 2021/08/09 14:00 | Lukas Klein v Tobias Kamke | 6-1,6-2 |