| Australian Open | 01/14 01:30 | 44 | [171] Roberto Marcora v Lukas Lacko [178] | 6-3,6-2 | |
| Challenger Bratislava | 11/06 20:15 | 25 | [182] Lukas Lacko v Damir Dzumhur [103] | 4-6,6-3,1-6 | |
| Challenger Bratislava | 11/05 18:10 | 24 | [182] Lukas Lacko v Viktor Troicki [159] | 7-5,7-6 | |
| Challenger Eckental | 11/01 14:20 | 27 | [103] Lloyd Harris v Lukas Lacko [193] | 6-7,6-3,6-3 | |
| Challenger Eckental | 10/31 16:10 | 26 | [304] John-Patrick Smith v Lukas Lacko [193] | 5-7,3-6 | |
| Challenger Eckental | 10/30 13:20 | 25 | [193] Lukas Lacko v Dennis Novak [124] | 6-4,4-6,6-4 | |
| Challenger Eckental | 10/28 19:20 | 24 | Lukas Lacko v Max Wiskandt | 6-4,6-1 | |
| Challenger Eckental | 10/28 19:00 | 24 | Lukas Lacko v Tommy Robredo | Cancelled | |
| Challenger Hamburg | 10/22 08:00 | 24 | Lukas Lacko v Botic Van De Zandschulp | Cancelled | |
| Challenger Ismaning | 10/20 11:30 | 29 | [214] Maxime Cressy v Lukas Lacko [239] | 3-6,0-6 | |
| Challenger Ismaning | 10/19 14:20 | 28 | [239] Lukas Lacko v Julian Lenz [259] | 6-3,3-6,7-6 | |
| Challenger Ismaning | 10/18 14:15 | 27 | [305] Teymuraz Gabashvili v Lukas Lacko [239] | 7-5,4-6,4-6 | |
| Challenger Ismaning | 10/17 15:15 | 26 | [239] Lukas Lacko v Filippo Baldi [163] | 6-1,6-4 | |
| Challenger Ismaning | 10/16 14:35 | 25 | Lukas Lacko v Vitaliy Sachko | 7-5,2-6,6-3 | |
| US Open | 08/23 15:00 | 46 | [230] Tobias Kamke v Lukas Lacko [217] | 7-5,6-3 | |
| US Open | 08/21 16:30 | 45 | [191] Nicola Kuhn v Lukas Lacko [217] | 4-6,6-7 | |
| US Open | 08/19 19:50 | 44 | [217] Lukas Lacko v Yannick Maden [122] | 6-4,6-3 | |
| Challenger Vancouver | 08/12 21:00 | 24 | [381] Tim V. Rijthoven v Lukas Lacko [215] | 6-7,6-4,6-1 | |
| Challenger Aptos | 08/08 19:35 | 26 | [109] Damir Dzumhur v Lukas Lacko [227] | 6-7,6-3,7-6 | |
| Challenger Aptos | 08/07 17:00 | 25 | [227] Lukas Lacko v Christopher Eubanks [179] | 7-6,7-6 | |
| Challenger Aptos | 08/05 20:20 | 24 | [202] Donald Young v Lukas Lacko [227] | 4-6,2-6 | |
| ATP Los Cabos | 07/28 01:25 | 64 | [387] Jacob Grills v Lukas Lacko [214] | 6-3,6-2 | |
| Challenger Recanati | 07/06 19:30 | 28 | [207] Lukas Lacko v Egor Gerasimov [167] | 3-6,6-1,3-6 | |
| Challenger Recanati | 07/05 19:05 | 27 | [207] Lukas Lacko v Viktor Galovic [196] | 7-5,6-3 | |
| Challenger Recanati | 07/04 09:15 | 26 | [207] Lukas Lacko v Emilio Gomez [184] | 7-6,4-6,6-3 | |
| Challenger Recanati | 07/03 14:35 | 25 | [207] Lukas Lacko v Alen Avidzba [416] | 6-2,6-4 | |
| Wimbledon | 06/24 12:30 | 44 | [154] Ramkumar Ramanathan v Lukas Lacko [144] | 6-3,6-2 | |
| Challenger Ilkley | 06/19 17:15 | 25 | [143] Lukas Lacko v Antoine Hoang [111] | 3-6,5-7 | |
| Challenger Ilkley | 06/18 10:00 | 24 | [143] Lukas Lacko v Adrian Menendez-Maceiras [150] | 6-3,6-4 | |
| ATP Hertogenbosch | 06/08 09:00 | 64 | [215] Jannik Sinner v Lukas Lacko [138] | 6-7,7-6,6-2 |