| Challenger Biella | 02/18 09:30 | 26 | [122] Lorenzo Musetti v Lacko, Lukas [186] | 6-4,6-3 | |
| Challenger Biella | 02/16 11:25 | 25 | [257] Kavcic, Blaz v Lacko, Lukas [186] | 3-6,2-6 | |
| Challenger Biella | 02/10 11:15 | 25 | [186] Lacko, Lukas v Federico Gaio [140] | 3-6,4-6 | |
| Challenger - Quimper | 02/06 14:00 | 28 | [157] Brandon Nakashima v Lacko, Lukas [200] | 4-6,7-5,7-5 | |
| Challenger - Quimper | 02/05 10:00 | 27 | [200] Lacko, Lukas v Federico Gaio [138] | 6-3,7-5 | |
| Challenger - Quimper | 02/05 09:00 | 26 | Lacko, Lukas v Arthur Cazaux | Walkover | |
| Challenger - Quimper | 02/04 09:30 | - | Lacko, Lukas v Arthur Cazaux | View | |
| Challenger - Quimper | 02/03 11:00 | 25 | [213] Mathias Bourgue v Lacko, Lukas [200] | 2-6,2-6 | |
| Challenger - Quimper | 01/25 12:30 | 25 | [200] Lacko, Lukas v Istomin, Denis [183] | 3-6,7-6,6-7 | |
| Open d'Australie | 01/11 11:55 | 60 | [200] Lacko, Lukas v Frederico Ferreira Silva [182] | 3-6,2-6 | |
| Challenger - Bratislava | 11/10 16:35 | 25 | [192] Lacko, Lukas v Stakhovsky, Sergiy [195] | 5-7,6-7 | |
| Challenger - Hambourg | 10/26 12:20 | 25 | [190] Lacko, Lukas v Nikola Milojevic [137] | 5-7,4-6 | |
| Challenger Ismaning | 10/21 18:50 | 26 | [152] Gunneswaran, Prajnesh v Lacko, Lukas [188] | 6-4,5-7,6-4 | |
| Challenger Ismaning | 10/20 14:00 | 25 | Lacko, Lukas v Max Hans Rehberg | 5-7,7-6,6-1 | |
| Challenger Biella | 09/29 08:00 | 25 | [180] Lacko, Lukas v Horansky, Filip [177] | 2-6,2-6 | |
| Open de France | 09/21 08:00 | 14 | [176] Lacko, Lukas v Oscar Otte [136] | 6-4,1-6,2-6 | |
| Challenger - Prostejov | 09/05 11:30 | 64 | [177] Lacko, Lukas v Gabashvili, Teimuraz [259] | Retired | |
| Challenger - Ostrava | 09/04 11:45 | 27 | [176] Botic Van De Zandschulp v Lacko, Lukas [177] | 5-7,6-3,6-1 | |
| Challenger - Ostrava | 09/03 08:00 | 26 | [177] Lacko, Lukas v Frederico Ferreira Silva [193] | 6-4,7-5 | |
| Challenger - Ostrava | 08/31 08:00 | 25 | [177] Lacko, Lukas v Horansky, Filip [175] | 7-6,6-2 | |
| Challenger Trieste | 08/24 08:00 | - | [205] Juan Pablo Ficovich v Lacko, Lukas [172] | 7-5,7-5 | |
| Challenger - Pau | 02/27 11:00 | 26 | [168] Lacko, Lukas v Quentin Halys [193] | 6-7,2-6 | |
| Challenger - Pau | 02/25 18:15 | 25 | [168] Lacko, Lukas v Sasikumar Mukund [279] | 6-4,7-6 | |
| ATP - Marseille | 02/16 10:00 | 64 | [165] Lacko, Lukas v Emil Ruusuvuori [102] | 4-6,4-6 | |
| ATP - Montpellier | 02/02 15:00 | 64 | [231] Elliot Benchetrit v Lacko, Lukas [178] | 6-3,6-3 | |
| Challenger - Quimper | 02/01 15:50 | 28 | [178] Lacko, Lukas v Cem Ilkel [266] | 3-6,7-6,6-7 | |
| Challenger - Quimper | 01/31 19:25 | 27 | [281] Zverev, Mischa v Lacko, Lukas [178] | 7-6,2-6,4-6 | |
| Challenger - Quimper | 01/30 13:40 | 26 | [242] Ortega-Olmedo, Roberto v Lacko, Lukas [178] | 2-6,2-6 | |
| Challenger - Quimper | 01/29 18:45 | 25 | Arnaboldi, Andrea v Lacko, Lukas | 6-7,6-4,3-6 | |
| Challenger Rennes | 01/22 18:30 | 25 | [178] Lacko, Lukas v Antoine Escoffier [371] | 5-7,2-6 |