| Challenger Surbiton | 06/06 12:25 | 26 | [138] Lukas Lacko v Matthew Ebden [64] | 5-7,6-7 | |
| Challenger Surbiton | 06/04 11:25 | 25 | [121] Peter Gojowczyk v Lukas Lacko [138] | 6-7,6-7 | |
| Challenger Surbiton | 06/03 10:00 | 24 | [171] Dustin Brown v Lukas Lacko [138] | 3-6,2-6 | |
| French Open | 05/20 09:50 | 44 | [420] Manuel Guinard v Lukas Lacko [139] | 7-6,4-6,6-1 | |
| Challenger Gwangju | 05/17 04:00 | 27 | [251] Akira Santillan v Lukas Lacko [146] | 6-4,6-3 | |
| Challenger Gwangju | 05/16 04:10 | 26 | [281] Cem Ilkel v Lukas Lacko [146] | Retired | |
| Challenger Gwangju | 05/15 02:00 | 25 | [386] Yan Bai v Lukas Lacko [146] | 6-7,4-6 | |
| Challenger Busan | 05/09 07:05 | 26 | [151] Lukas Lacko v Yasutaka Uchiyama [213] | 6-3,4-6,0-6 | |
| Challenger Busan | 05/08 03:00 | 25 | [151] Lukas Lacko v Luke Saville [313] | 3-6,6-3,6-4 | |
| Challenger Seoul | 05/02 02:00 | 26 | [121] Lukas Lacko v Tatsuma Ito [153] | 4-6,1-6 | |
| Challenger Seoul | 05/01 02:00 | 25 | [121] Lukas Lacko v Luke Saville [320] | 6-3,6-4 | |
| Challenger Taipei | 04/11 03:00 | 26 | [125] Lukas Lacko v Yuichi Sugita [188] | 6-3,3-6,4-6 | |
| Challenger Taipei | 04/09 08:40 | 25 | [125] Lukas Lacko v Marc-Andrea Huesler [358] | 4-6,7-6,6-2 | |
| ATP Miami | 03/21 15:00 | 23 | [65] Robin Haase v Lukas Lacko [130] | 6-2,6-4 | |
| ATP Miami | 03/20 15:20 | 45 | [130] Lukas Lacko v Denis Istomin [102] | Walkover | |
| ATP Miami | 03/18 14:00 | 44 | [66] Juan Ignacio Londero v Lukas Lacko [130] | 4-6,1-6 | |
| Challenger Phoenix | 03/13 18:55 | 25 | [133] Lukas Lacko v John Millman [42] | 7-6,4-6,6-7 | |
| Challenger Phoenix | 03/12 21:45 | 24 | [224] Yasutaka Uchiyama v Lukas Lacko [133] | 7-5,4-6,2-6 | |
| ATP Indian Wells | 03/06 22:15 | 45 | [53] Radu Albot v Lukas Lacko [133] | 7-6,7-6 | |
| ATP Indian Wells | 03/06 00:30 | 44 | [133] Lukas Lacko v Peter Polansky [127] | 6-4,6-7,7-6 | |
| Challenger Indian Wells | 02/27 18:00 | 25 | [178] Salvatore Caruso v Lukas Lacko [131] | 4-6,6-3,6-1 | |
| ATP Delray Beach | 02/20 23:00 | 26 | [133] Lukas Lacko v John Isner [9] | 4-6,3-6 | |
| ATP Delray Beach | 02/18 17:30 | 25 | [133] Lukas Lacko v Yosuke Watanuki [181] | 6-4,6-4 | |
| ATP New York | 02/11 19:25 | 25 | [130] Lukas Lacko v Bernard Tomic [87] | 4-6,2-6 | |
| ATP Sofia | 02/03 15:15 | 64 | Lukas Lacko v Alexandar Lazarov | 6-7,2-6 | |
| Australian Open | 01/08 06:30 | 44 | [113] Lukas Lacko v Tim Smyczek [167] | 4-6,6-4,6-7 | |
| Challenger Bratislava | 11/08 16:00 | 26 | [78] Lukas Lacko v Egor Gerasimov [176] | 3-6,3-6 | |
| Challenger Bratislava | 11/07 15:30 | 25 | [78] Lukas Lacko v Stephane Robert [160] | 4-6,6-4,7-5 | |
| Challenger Eckental | 10/31 16:00 | 25 | [82] Lukas Lacko v Simone Bolelli [145] | 6-7,3-6 | |
| ATP Stockholm | 10/18 12:30 | 26 | [81] Lukas Lacko v Fabio Fognini [14] | 4-6,4-6 |