| Challenger Ismaning | 10/29 16:55 | 27 | [269] Matthias Bachinger v Lukas Lacko [212] | 5-7,6-3,4-6 | |
| Challenger Ismaning | 10/27 15:25 | 26 | [212] Lukas Lacko v Tomas Machac [136] | 6-7,6-4,7-6 | |
| Challenger Ismaning | 10/25 13:35 | 25 | [294] Marius Copil v Lukas Lacko [212] | 6-7,6-7 | |
| Challenger Biel | 09/21 16:00 | 25 | [181] Lukas Lacko v Henri Laaksonen [116] | 5-7,2-6 | |
| Challenger Cassis | 09/07 08:00 | 25 | Lukas Lacko v Bernard Tomic | Cancelled | |
| Challenger Mallorca | 09/05 17:00 | 29 | [123] Yasutaka Uchiyama v Lukas Lacko [197] | 7-5,6-7,1-6 | |
| Challenger Mallorca | 09/04 14:00 | 28 | [197] Lukas Lacko v Tobias Kamke [252] | 6-0,6-3 | |
| Challenger Mallorca | 09/03 17:40 | 27 | [197] Lukas Lacko v Frederico Ferreira Silva [180] | 7-5,7-5 | |
| Challenger Mallorca | 09/02 17:00 | 26 | [235] Dimitar Kuzmanov v Lukas Lacko [197] | 2-6,6-7 | |
| Challenger Mallorca | 09/01 18:40 | 25 | [367] Johannes Haerteis v Lukas Lacko [197] | 2-6,3-6 | |
| US Open | 08/25 16:15 | 14 | [197] Lukas Lacko v Holger Vitus Nodskov Rune [145] | 4-6,4-6 | |
| ATP Atlanta | 07/24 19:25 | 26 | [159] Jason Jung v Lukas Lacko [191] | 6-4,6-7,6-3 | |
| Challenger Cary | 07/19 23:45 | 25 | [216] Mikael Torpegaard v Lukas Lacko [191] | 6-4,6-2 | |
| ATP Newport | 07/11 18:30 | 14 | [186] Lukas Lacko v Brayden Schnur [233] | 0-6,4-6 | |
| Wimbledon | 06/22 10:00 | 14 | [214] Lukas Lacko v Nikola Milojevic [147] | 4-6,4-6 | |
| ATP Halle | 06/17 12:00 | 26 | [51] Lloyd Harris v Lukas Lacko [214] | 6-3,7-6 | |
| ATP Halle | 06/15 09:00 | 25 | [62] Guido Pella v Lukas Lacko [214] | 7-6,5-7,1-6 | |
| ATP Halle | 06/13 10:40 | 19 | [213] Lukas Lacko v Joao Sousa [114] | 4-6,6-4,6-3 | |
| ATP Halle | 06/12 14:35 | 14 | [79] Egor Gerasimov v Lukas Lacko [213] | 4-6,5-7 | |
| Challenger Bratislava | 06/08 10:00 | 25 | Tallon Griekspoor v Lukas Lacko | View | |
| Challenger Biella | 05/31 13:05 | 25 | [213] Lukas Lacko v Nikola Milojevic [140] | 2-6,3-6 | |
| French Open | 05/25 15:20 | 14 | [94] Carlos Alcaraz v Lukas Lacko [212] | 6-3,6-3 | |
| Challenger Prague | 05/02 12:00 | 14 | [232] Tomas Martin Etcheverry v Lukas Lacko [206] | 6-1,6-3 | |
| Challenger Ostrava | 04/27 08:00 | 25 | [205] Denis Istomin v Lukas Lacko [206] | 0-6,6-1,6-4 | |
| Challenger Lugano | 03/24 09:30 | 25 | [290] Lucas Miedler v Lukas Lacko [198] | 7-6,6-4 | |
| ATP Dubai | 03/13 08:30 | 14 | [75] Radu Albot v Lukas Lacko [199] | 3-6,6-4,6-4 | |
| ATP Doha | 03/07 12:30 | 64 | [84] Lloyd Harris v Lukas Lacko [197] | 6-4,6-3 | |
| ATP Doha | 03/06 09:00 | 64 | Mousa Shanan Zayed v Lukas Lacko | 1-6,1-6 | |
| ATP Montpellier | 02/22 09:30 | 19 | [196] Lukas Lacko v Peter Gojowczyk [144] | 2-6,1-6 | |
| ATP Montpellier | 02/21 10:00 | 14 | [109] Kamil Majchrzak v Lukas Lacko [186] | 6-4,4-6,4-6 |