Stadium: Hard 20 Round: 62 Ground: Hardcourt outdoor
| ITF - M15 Héraklion | 2021/05/17 09:30 | Daniel Little v Eisenzapf, David | 6-3,6-3 |
| ITF - M15 Héraklion | 2021/05/16 10:30 | Ioannis Kountourakis v Eisenzapf, David | 3-6,1-6 |
| German Championship | 2020/12/07 15:30 | Seifert, Stefan v Eisenzapf, David | 6-1,6-4 |
| ITF Germany F16 | 2018/10/21 08:00 | de Valk, Roy Sarut v Eisenzapf, David | 6-4,3-6,6-3 |
| ITF Germany F4 | 2016/06/20 15:30 | Eisenzapf, David v Gohlke, Delf | 4-6,5-7 |
| ITF Germany F4 | 2016/06/18 12:30 | Eisenzapf, David v Jannik Opitz | 6-2,6-1 |
| ITF Germany F16 | 2015/10/11 07:00 | Presuhn, Bastien v Eisenzapf, David | 6-4,6-4 |
| ITF Germany F10 Qual | 2015/08/02 08:00 | Peters, Flemming v Eisenzapf, David | 6-3,6-3 |
| ITF - M15 Héraklion | 2021/05/23 06:30 | Papounidis, Ioannis v Harry Wendelken | 6-4,3-6,3-10 |
| ITF - M15 Monastir | 2021/05/04 08:00 | Zachary Svajda v Harry Wendelken | 7-5,6-1 |
| ITF - M15 Monastir | 2021/05/03 12:00 | Pereira, Miguel Fernando v Harry Wendelken | 6-7,5-7 |
| ITF - M15 Monastir | 2021/05/02 10:30 | Taketo Takamisawa v Harry Wendelken | 1-6,4-6 |
| ITF - M15 Monastir | 2021/04/26 12:30 | Remy Bertola v Harry Wendelken | 6-4,3-6,10-5 |
| ITF - M15 Monastir | 2021/04/26 08:00 | Osgar O'Hoisin v Harry Wendelken | 6-4,4-6,7-10 |
| ITF - M15 Monastir | 2021/04/25 09:00 | Kirill Mishkin v Harry Wendelken | 0-6,0-6 |
| ITF - M15 Monastir | 2021/04/20 08:00 | Harry Wendelken v Martinez, Mirko | 1-6,2-6 |