Stadium: Court 1 Round: 44 Ground: Hardcourt outdoor
| ITF M15 Opava | 2019/10/29 14:10 | Nikolas Lahky v Lucas Catarina | 2-6,1-6 |
| ITF M15 Tabarka | 2019/10/06 11:00 | Ignacio Vinas v Nikolas Lahky | 6-3,7-5 |
| ITF M15 Tabarka | 2019/10/02 08:30 | Nikolas Lahky v Marc Dijkhuizen | 3-6,5-7 |
| ITF M15 Tabarka | 2019/09/30 08:30 | Nikolas Lahky v Miguel Fernando Pereira | 2-6,6-4,10-2 |
| ITF M15 Tabarka | 2019/09/29 11:00 | Gregorio Lulli v Nikolas Lahky | 7-5,1-6,5-10 |
| ITF M25 Ricany | 2019/09/22 08:00 | Nikolas Lahky v Noah Thurner | 3-6,6-3,8-10 |
| ITF M15 Szekesfehervar | 2019/09/02 08:00 | Juan Pablo Paz v Nikolas Lahky | 6-2,6-2 |
| ITF M15 Szekesfehervar | 2019/09/01 13:00 | Nikolas Lahky v Marcell Bartakovics | 2-6,6-4,10-5 |
| ITF M15 Sharm El Sheikh | 2019/11/03 08:00 | Stefan Cizelj-Zivkovic v Shamirul S Mohd Adam Das | 2-6,3-6 |
| ITF M15 Sharm El Sheikh | 2019/10/27 10:00 | Tim Riedel v Stefan Cizelj-Zivkovic | 6-4,6-4 |
| ITF M15 Tabarka | 2019/10/13 08:30 | Boruch Skierkier v Stefan Cizelj-Zivkovic | 6-1,6-0 |
| ITF M15 Burgas | 2019/10/07 07:00 | Stefan Cizelj-Zivkovic v Ivan Mikhaylyuk | 4-6,0-6 |
| ITF M15 Chornomorsk | 2019/09/22 07:30 | Stefan Cizelj-Zivkovic v Svyatoslav Ilnytskyy | 2-6,5-7 |
| ITF M15 Tabarka | 2019/09/15 13:00 | Stefan Cizelj-Zivkovic v Francesco Liucci | 2-6,0-6 |
| ITF M15 Tabarka | 2019/09/15 08:00 | Jason Janis v Stefan Cizelj-Zivkovic | 7-5,2-6,6-10 |
| ITF M25 Ust-Kamenogorsk | 2019/08/26 04:00 | Stefan Cizelj-Zivkovic v David Bogatin | 1-6,3-6 |