Stadium: Center Court Round: 28 Ground: Carpet indoor
| Challenger Ismaning | 2019/10/18 14:15 | Teymuraz Gabashvili v Lukas Lacko | 7-5,4-6,4-6 |
| Challenger Ismaning | 2019/10/17 15:15 | Lukas Lacko v Filippo Baldi | 6-1,6-4 |
| Challenger Ismaning | 2019/10/16 14:35 | Lukas Lacko v Vitaliy Sachko | 7-5,2-6,6-3 |
| US Open | 2019/08/23 15:00 | Tobias Kamke v Lukas Lacko | 7-5,6-3 |
| US Open | 2019/08/21 16:30 | Nicola Kuhn v Lukas Lacko | 4-6,6-7 |
| US Open | 2019/08/19 19:50 | Lukas Lacko v Yannick Maden | 6-4,6-3 |
| Challenger Vancouver | 2019/08/12 21:00 | Tim Van Rijthoven v Lukas Lacko | 6-7,6-4,6-1 |
| Challenger Aptos | 2019/08/08 19:35 | Damir Dzumhur v Lukas Lacko | 6-7,6-3,7-6 |
| Challenger Ismaning | 2019/10/17 16:35 | Julian Lenz v Constant Lestienne | 7-6,6-4 |
| Challenger Ismaning | 2019/10/15 11:30 | Lukas Klein v Julian Lenz | 4-6,3-6 |
| Challenger Ismaning | 2019/10/14 08:00 | Julian Lenz v Jeremy Schifris | 6-3,6-3 |
| Challenger Nur-Sultan 2 | 2019/10/02 09:50 | Denis Istomin v Julian Lenz | 7-5,6-1 |
| Challenger Nur-Sultan 2 | 2019/10/01 09:00 | Julian Lenz v Beibit Zhukayev | 6-2,7-6 |
| Challenger Orleans | 2019/09/24 14:55 | Viktor Durasovic v Julian Lenz | 6-3,7-6 |
| ATP Metz | 2019/09/17 17:45 | Julian Lenz v Pablo Carreno Busta | 1-6,1-6 |
| ATP Metz | 2019/09/16 09:00 | Matthias Bachinger v Julian Lenz | 4-6,4-6 |