Stadium: Court 3 Round: 25 Ground: Grass
| ATP Vienna Qual | 2017/10/22 13:50 | Guido Pella v Lukas Lacko | 6-2,6-2 |
| ATP Stuttgart | 2021/06/09 09:00 | Guido Pella v Jordan Thompson | 3-6,4-6 |
| French Open | 2021/06/02 14:00 | Marcos Giron v Guido Pella | 7-6,6-1,6-7,6-4 |
| French Open | 2021/05/30 11:00 | Guido Pella v Daniel Elahi Galan | 6-3,7-6,7-5 |
| ATP Geneva | 2021/05/18 12:50 | Fabio Fognini v Guido Pella | 6-2,6-2 |
| ATP Barcelona | 2021/04/19 13:10 | Kei Nishikori v Guido Pella | 4-6,7-6,6-2 |
| ATP Monte Carlo | 2021/04/13 09:00 | Guido Pella v Lucas Pouille | 3-6,4-6 |
| ATP Cagliari | 2021/04/05 09:00 | Guido Pella v Egor Gerasimov | 4-6,0-6 |
| Australian Open | 2021/02/09 00:00 | Guido Pella v Borna Coric | 3-6,6-7,5-7 |
| ATP Halle | 2021/06/13 10:40 | Lukas Lacko v Joao Sousa | 4-6,6-4,6-3 |
| ATP Halle | 2021/06/12 14:35 | Egor Gerasimov v Lukas Lacko | 4-6,5-7 |
| Challenger Biella | 2021/05/31 13:05 | Lukas Lacko v Nikola Milojevic | 2-6,3-6 |
| French Open | 2021/05/25 15:20 | Carlos Alcaraz Garfia v Lukas Lacko | 6-3,6-3 |
| Challenger Prague | 2021/05/02 12:00 | Tomas Martin Etcheverry v Lukas Lacko | 6-1,6-3 |
| Challenger Ostrava | 2021/04/27 08:00 | Denis Istomin v Lukas Lacko | 0-6,6-1,6-4 |
| Challenger Lugano | 2021/03/24 09:30 | Lucas Miedler v Lukas Lacko | 7-6,6-4 |
| ATP Dubai | 2021/03/13 08:30 | Radu Albot v Lukas Lacko | 3-6,6-4,6-4 |