| Singles | |
|---|---|
| 2020 Slovak Open | |
| Champion |  Maximilian Marterer |
| Runner-up |  Tomáš Macháč |
| Score | 6–7(3–7), 6–2, 7–5 |
Dennis Novak was the defending champion [1] but chose not to defend his title.
Maximilian Marterer won the title after defeating Tomáš Macháč 6–7(3–7), 6–2, 7–5 in the final.
Emil Ruusuvuori (quarterfinals)
Yasutaka Uchiyama (first round)
Kamil Majchrzak (second round)
Antoine Hoang (semifinals)
Henri Laaksonen (first round)
Nikola Milojević (second round)
Federico Gaio (first round) Lorenzo Giustino (second round)| Semifinals | Final | ||||||||||||
| WC |  Lukáš Klein | 65 | 2 | ||||||||||
| Q | Tomáš Macháč | 77 | 6 | ||||||||||
| Q | Tomáš Macháč | 77 | 2 | 5 | |||||||||
| PR | Maximilian Marterer | 63 | 6 | 7 | |||||||||
| 4 | Antoine Hoang | 3 | 4 | ||||||||||
| PR | Maximilian Marterer | 6 | 6 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | E Ruusuvuori | 6 | 6 | ||||||||||||||||||||||||
 S Diez | 3 | 3 | 1 | E Ruusuvuori | 6 | 6 | |||||||||||||||||||||
| A Rinderknech | 6 | 65 | 7 | A Rinderknech | 1 | 4 | |||||||||||||||||||||
 L Broady | 4 | 77 | 5 | 1 | E Ruusuvuori | 4 | 5 | ||||||||||||||||||||
| F Horanský | 4 | 4 | WC | L Klein | 6 | 7 | |||||||||||||||||||||
| WC | L Klein | 6 | 6 | WC | L Klein | 6 | 6 | ||||||||||||||||||||
| Y Maden | 5 | 6 | 4 | 8 | L Giustino | 4 | 3 | ||||||||||||||||||||
| 8 | L Giustino | 7 | 3 | 6 | WC | L Klein | 65 | 2 | |||||||||||||||||||
| 3 | K Majchrzak | 6 | 6 | Q | T Macháč | 77 | 6 | ||||||||||||||||||||
| WC | A Molčan | 2 | 1 | 3 | K Majchrzak | 5 | 77 | 1 | |||||||||||||||||||
| Q | B Schnur | 4 | 4 | Q | T Macháč | 7 | 65 | 6 | |||||||||||||||||||
| Q | T Macháč | 6 | 6 | Q | T Macháč | 6 | 6 | ||||||||||||||||||||
| WC | J Lehečka | 6 | 4 | 65 | Alt | M Viola | 2 | 4 | |||||||||||||||||||
| Alt | M Viola | 2 | 6 | 77 | Alt | M Viola | 77 | 4 | 6 | ||||||||||||||||||
| SE | A Arnaboldi | 5 | 64 | 6 | N Milojević | 65 | 6 | 3 | |||||||||||||||||||
| 6 | N Milojević | 7 | 77 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 5 | H Laaksonen | 3 | 6 | 3 | |||||||||||||||||||||||
 B van de Zandschulp | 6 | 3 | 6 | B van de Zandschulp | 60 | 78 | 1 | ||||||||||||||||||||
| Q | M Bourgue | 77 | 6 | Q | M Bourgue | 77 | 66 | 6 | |||||||||||||||||||
 S Ofner | 64 | 1 | Q | M Bourgue | |||||||||||||||||||||||
 M Cressy | 6 | 4 | 64 | 4 | A Hoang | w/o | |||||||||||||||||||||
| R Marcora | 2 | 6 | 77 | R Marcora | 3 | 4 | |||||||||||||||||||||
| SE | Q Halys | 3 | 3 | 4 | A Hoang | 6 | 6 | ||||||||||||||||||||
| 4 | A Hoang | 6 | 6 | 4 | A Hoang | 3 | 4 | ||||||||||||||||||||
| 7 | F Gaio | 3 | 4 | PR | M Marterer | 6 | 6 | ||||||||||||||||||||
 R Safiullin | 6 | 6 | R Safiullin | 6 | 4 | 4 | |||||||||||||||||||||
| L Lacko | 5 | 66 |  S Stakhovsky | 4 | 6 | 6 | |||||||||||||||||||||
| S Stakhovsky | 7 | 78 | S Stakhovsky | ||||||||||||||||||||||||
| Q | J Lenz | 5 | 4 | PR | M Marterer | w/o | |||||||||||||||||||||
| PR | M Marterer | 7 | 6 | PR | M Marterer | 77 | 6 | ||||||||||||||||||||
 B Rola | 78 | 6 | B Rola | 64 | 2 | ||||||||||||||||||||||
| 2 | Y Uchiyama | 66 | 4 | ||||||||||||||||||||||||
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