Stadium: Center Court Round: 25 Ground: Hardcourt outdoor
| Challenger Ortisei | 2018/10/09 14:25 | Ante Pavic v Lukas Lacko | 7-6,7-6 |
| ATP St Petersburg | 2018/09/20 13:20 | Marco Cecchinato v Lukas Lacko | 7-5,7-6 |
| ATP St Petersburg | 2018/09/18 15:30 | Ruben Bemelmans v Lukas Lacko | 2-6,6-4,5-7 |
| US Open | 2018/08/27 21:40 | Vasek Pospisil v Lukas Lacko | 7-5,6-3,6-2 |
| ATP Winston-Salem | 2018/08/20 21:15 | Horacio Zeballos v Lukas Lacko | 7-6,7-5 |
| ATP Washington | 2018/07/31 20:55 | Lukas Lacko v Denis Kudla | 7-6,1-6,4-6 |
| ATP Atlanta | 2018/07/25 17:00 | Ryan Harrison v Lukas Lacko | 2-6,6-2,6-3 |
| ATP Atlanta | 2018/07/23 19:40 | Lukas Lacko v Prajnesh Gunneswaran | 6-2,6-2 |
| ATP Shanghai | 2018/10/06 05:20 | John Millman v Radu Albot | 4-6,4-6 |
| US Open | 2018/09/06 01:05 | Novak Djokovic v John Millman | 6-3,6-4,6-4 |
| US Open | 2018/09/04 01:00 | John Millman v Roger Federer | 3-6,7-5,7-6,7-6 |
| US Open | 2018/09/01 15:00 | John Millman v Mikhail Kukushkin | 6-4,4-6,6-1,6-3 |
| US Open | 2018/08/30 16:00 | Fabio Fognini v John Millman | 1-6,6-4,4-6,1-6 |
| US Open | 2018/08/28 17:55 | Jenson Brooksby v John Millman | 4-6,2-6,0-6 |
| ATP Winston-Salem | 2018/08/20 19:00 | John Millman v Taro Daniel | 4-6,6-7 |
| ATP Hamburg | 2018/07/26 13:00 | Dominic Thiem v John Millman | 6-2,6-2 |