| Singles | |
|---|---|
| 2021 Slovak Open II | |
| Champion |  Tallon Griekspoor |
| Runner-up |  Zsombor Piros |
| Score | 6–3, 6–2 |
Maximilian Marterer was the defending champion [1] but lost in the quarterfinals to Stefano Travaglia.
Tallon Griekspoor won the title after defeating Zsombor Piros 6–3, 6–2 in the final.
Stefano Travaglia (semifinals, retired) Tallon Griekspoor (champion)
Carlos Taberner (first round)
Norbert Gombos (first round) Alex Molčan (semifinals)
Gilles Simon (withdrew)
Liam Broady (second round)
Tomáš Macháč (first round)| Semifinals | Final | ||||||||||||
| 1 | Stefano Travaglia | 65 | 2r | ||||||||||
| Q | Zsombor Piros | 77 | 3 | ||||||||||
| Q | Zsombor Piros | 3 | 2 | ||||||||||
| 2 | Tallon Griekspoor | 6 | 6 | ||||||||||
| 5 | Alex Molčan | 77 | 3 | 4 | |||||||||
| 2 | Tallon Griekspoor | 65 | 6 | 6 | |||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | S Travaglia | 77 | 6 | ||||||||||||||||||||||||
| Z Kolář | 64 | 3 | 1 | S Travaglia | 6 | 6 | |||||||||||||||||||||
 C İlkel | 6 | 61 | 6 | C İlkel | 4 | 2 | |||||||||||||||||||||
| LL |  A Shevchenko | 4 | 77 | 3 | 1 | S Travaglia | 77 | 6 | |||||||||||||||||||
 M Marterer | 4 | 6 | 6 | M Marterer | 61 | 1 | |||||||||||||||||||||
 J Rodionov | 6 | 1 | 4 | M Marterer | 6 | 78 | |||||||||||||||||||||
 I Marchenko | 2 | 1 | 7 | L Broady | 4 | 66 | |||||||||||||||||||||
| 7 | L Broady | 6 | 6 | 1 | S Travaglia | 65 | 2r | ||||||||||||||||||||
| 3 | C Taberner | 2 | 65 | Q | Z Piros | 77 | 3 | ||||||||||||||||||||
 F Ferreira Silva | 6 | 77 | F Ferreira Silva | 6 | 7 | ||||||||||||||||||||||
| Q | D Svrčina | 2 | 77 | 6 | Q | D Svrčina | 4 | 5 | |||||||||||||||||||
| F Horanský | 6 | 65 | 1 | F Ferreira Silva | 0 | 4 | |||||||||||||||||||||
| Q | Miloš Karol | 4 | 3 | Q | Z Piros | 6 | 6 | ||||||||||||||||||||
| L Lacko | 6 | 6 | L Lacko | 2 | 4 | ||||||||||||||||||||||
| Q | Z Piros | 7 | 3 | 6 | Q | Z Piros | 6 | 6 | |||||||||||||||||||
| 8 | T Macháč | 5 | 6 | 4 | |||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 5 | A Molčan | 6 | 79 | ||||||||||||||||||||||||
 R Ramanathan | 3 | 67 | 5 | A Molčan | 6 | 6 | |||||||||||||||||||||
| WC | J Forejtek | 2 | 4 | Alt | T Kamke | 2 | 2 | ||||||||||||||||||||
| Alt | T Kamke | 6 | 6 | 5 | A Molčan | 6 | 4 | 6 | |||||||||||||||||||
| J Sousa | 66 | 77 | 62 |  D Džumhur | 1 | 6 | 3 | ||||||||||||||||||||
| A Çelikbilek | 78 | 63 | 77 | A Çelikbilek | 4 | 4 | |||||||||||||||||||||
| D Džumhur | 6 | 6 | D Džumhur | 6 | 6 | ||||||||||||||||||||||
| 4 | N Gombos | 3 | 3 | 5 | A Molčan | 77 | 3 | 4 | |||||||||||||||||||
| LL |  S Mochizuki | 65 | 3 | 2 | T Griekspoor | 65 | 6 | 6 | |||||||||||||||||||
 K Żuk | 77 | 6 | K Żuk | 6 | 3 | 2 | |||||||||||||||||||||
| S Stakhovsky | 4 | 5 | J Lehečka | 2 | 6 | 6 | |||||||||||||||||||||
| J Lehečka | 6 | 7 | J Lehečka | 63 | 4 | ||||||||||||||||||||||
| Q | D Kalenichenko | 77 | 77 | 2 | T Griekspoor | 77 | 6 | ||||||||||||||||||||
| WC | Lukáš Palovič | 64 | 65 | Q | D Kalenichenko | 62 | 61 | ||||||||||||||||||||
| WC | Lukáš Pokorný | 64 | 1 | 2 | T Griekspoor | 77 | 77 | ||||||||||||||||||||
| 2 | T Griekspoor | 77 | 6 | ||||||||||||||||||||||||
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