# 2020 Prosperita Open – Singles

Kamil Majchrzak was the defending champion but chose not to defend his title.
Aslan Karatsev won the title after defeating Oscar Otte 6–4, 6–2 in the final.

## Seeds

* Henri Laaksonen (second round)
* Ilya Ivashka (quarterfinals)
* Chung Hyeon (first round)
* Ernests Gulbis (second round)
* Martin Kližan (first round)
* Arthur Rinderknech (withdrew)
* Steven Diez (second round)
* Sergiy Stakhovsky (second round, retired)

## Draw
### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking

### Finals

| Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| | Botic van de Zandschulp | 3 | 3 | | | | |
| SE | Aslan Karatsev | 6 | 6 | | | | |
| SE | Aslan Karatsev | 6 | 6 | SE | Aslan Karatsev | 6 | 6 |
| | | | | | Oscar Otte | 4 | 2 |
| | Oscar Otte | 6 | 6 | | Oscar Otte | 4 | 2 |
| SE | Tallon Griekspoor | 2 | 4 | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | H Laaksonen | 7 | 6 | | | | | | | | | | | | | | | |
| | B Schnur | 5 | 1 | | 1 | H Laaksonen | 3 | 2 | | | | | | | | | | |
| WC | O Virtanen | 5 | 4 | | | B van de Zandschulp | 6 | 6 | | | | | | | | | | |
| | B van de Zandschulp | 7 | 6 | | | | | | | | B van de Zandschulp | 5 | 6 | 6 | | | | |
| | L Lacko | 7$^8$ | 6 | | | | | | | | L Lacko | 7 | 3 | 1 | | | | |
| | F Horanský | 6$^6$ | 2 | | | L Lacko | 6 | 7 | | | | | | | | | | |
| | F Ferreira Silva | 7$^7$ | 6 | | | F Ferreira Silva | 4 | 5 | | | | | | | | | | |
| 5 | M Kližan | 6$^4$ | 2 | | | | | | | | | | | | | B van de Zandschulp | 3 | 3 |
| 4 | E Gulbis | 6 | 6 | | | | | | | | | | | | SE | A Karatsev | 6 | 6 |
| WC | D Svrčina | 4 | 1 | | 4 | E Gulbis | 1 | 4 | | | | | | | | | | |
| SE | A Karatsev | 6 | 6 | | SE | A Karatsev | 6 | 6 | | | | | | | | | | |
| WC | T Macháč | 4 | 4 | | | | | | | SE | A Karatsev | 6 | 6 | | | | | |
| Q | M Moraing | 7 | 6 | | | | | | | Q | M Moraing | 3 | 3 | | | | | |
| | R Olivo | 5 | 0 | | Q | M Moraing | 6 | 6$^4$ | 4 | | | | | | | | | |
| | P Polansky | 6 | 4 | 3 | 8 | S Stakhovsky | 1 | 7$^7$ | 0$^r$ | | | | | | | | | |
| 8 | S Stakhovsky | 4 | 6 | 6 | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| LL | M Jaziri | 3 | 5 | | | | | | | | | | | | | | |
| Q | Z Kolář | 6 | 7 | | Q | Z Kolář | 5 | 6 | 7 | | | | | | | | |
| | R Safiullin | 3 | 6 | 3 | | D Popko | 7 | 4 | 5 | | | | | | | | |
| | D Popko | 6 | 1 | 6 | | | | | | Q | Z Kolář | 1 | 1 | | | | |
| | A Vukic | 6 | 4 | 3 | | | | | | | O Otte | 6 | 6 | | | | |
| | O Otte | 3 | 6 | 6 | | O Otte | 6 | 6 | | | | | | | | | |
| | L Rosol | 2 | 6 | 6 | | L Rosol | 2 | 0 | | | | | | | | | |
| 3 | Hy Chung | 6 | 4 | 0 | | | | | | | | | | | O Otte | 6 | 6 |
| 7 | S Diez | 6 | 6 | | | | | | | | | | | SE | T Griekspoor | 2 | 4 |
| | R Molleker | 1 | 2 | | 7 | S Diez | 6 | 2 | 4 | | | | | | | | |
| SE | T Griekspoor | 4 | 6 | 7$^7$ | SE | T Griekspoor | 4 | 6 | 6 | | | | | | | | |
| | R Haase | 6 | 4 | 6$^3$ | | | | | | SE | T Griekspoor | 7$^7$ | 6 | | | | |
| Q | M-A Hüsler | 6 | 4 | 5 | | | | | | 2 | I Ivashka | 6$^3$ | 3 | | | | |
| | V Troicki | 3 | 6 | 7 | | V Troicki | 3 | 5 | | | | | | | | | |
| Q | V Kopřiva | 4 | 6$^4$ | | 2 | I Ivashka | 6 | 7 | | | | | | | | | |
| 2 | I Ivashka | 6 | 7$^7$ | | | | | | | | | | | | | | |