Stadium: Center Round: 24 Ground: Hardcourt outdoor
| ATP Atlanta | 2017/07/26 21:20 | Donald Young v Lukas Lacko | 3-6,1-6 |
| ATP Washington | 2019/07/30 01:50 | Hubert Hurkacz v Donald Young | 6-1,6-4 |
| ATP Washington | 2019/07/28 14:00 | Peter Gojowczyk v Donald Young | 6-2,3-6,4-6 |
| ATP Washington | 2019/07/27 16:10 | Nicholas Reyes v Donald Young | 2-6,0-6 |
| ATP Atlanta | 2019/07/21 18:50 | Donald Young v Jason Jung | 1-6,6-7 |
| ATP Atlanta | 2019/07/20 17:15 | Dominik Koepfer v Donald Young | 6-3,4-6,3-6 |
| Challenger Winnetka | 2019/07/11 20:35 | Bradley Klahn v Donald Young | 6-1,6-3 |
| Challenger Winnetka | 2019/07/11 01:10 | Sekou Bangoura v Donald Young | 3-6,4-6 |
| Wimbledon | 2019/06/27 10:00 | Ruben Bemelmans v Donald Young | 6-4,6-4,6-1 |
| ATP Los Cabos | 2019/07/28 01:25 | Jacob Grills v Lukas Lacko | 6-3,6-2 |
| Challenger Recanati | 2019/07/06 19:30 | Lukas Lacko v Egor Gerasimov | 3-6,6-1,3-6 |
| Challenger Recanati | 2019/07/05 19:05 | Lukas Lacko v Viktor Galovic | 7-5,6-3 |
| Challenger Recanati | 2019/07/04 09:15 | Lukas Lacko v Emilio Gomez | 7-6,4-6,6-3 |
| Challenger Recanati | 2019/07/03 14:35 | Lukas Lacko v Alen Avidzba | 6-2,6-4 |
| Wimbledon | 2019/06/24 12:30 | Ramkumar Ramanathan v Lukas Lacko | 6-3,6-2 |
| Challenger Ilkley | 2019/06/19 17:15 | Lukas Lacko v Antoine Hoang | 3-6,5-7 |
| Challenger Ilkley | 2019/06/18 10:00 | Lukas Lacko v Adrian Menendez-Maceiras | 6-3,6-4 |