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