2021 Slovak Open II – Doubles
# 2021 Slovak Open II – Doubles

Harri Heliövaara and Emil Ruusuvuori were the defending champions but chose not to defend their title.

Filip Horanský and Sergiy Stakhovsky won the title after defeating Denys Molchanov and Aleksandr Nedovyesov 6–4, 6–4 in the final.

## Seeds

* Roman Jebavý / Jonny O'Mara (quarterfinals)
* Denys Molchanov / Aleksandr Nedovyesov (final)
* David Pel / Sem Verbeek (first round)
* Szymon Walków / Jan Zieliński (first round)

## 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

| First round | First round | First round | First round | First round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| | | | | | 1 | R Jebavý J O'Mara | $6^3$ | 3 | | | | | | | | | | |
| | Z Kolář J Lehečka | $6^6$ | $7^7$ | [7] | | F Horanský S Stakhovsky | $7^7$ | 6 | | | | | | | | | | |
| | F Horanský S Stakhovsky | $7^8$ | $6^4$ | [10] | | | | | | | F Horanský S Stakhovsky | $6^5$ | $7^7$ | [14] | | | | |
| 4 | S Walków J Zieliński | 6 | 3 | [5] | | | | | | | F Ferreira Silva E Kırkın | $7^7$ | $6^2$ | [12] | | | | |
| WC | Miloš Karol Lukáš Pokorný | 2 | 6 | [10] | WC | M Karol L Pokorný | 6 | 1 | [8] | | | | | | | | | |
| | Mats Hermans P Niklas-Salminen | 4 | 2 | | | F Ferreira Silva E Kırkın | 4 | 6 | [10] | | | | | | | | | |
| | F Ferreira Silva E Kırkın | 6 | 6 | | | | | | | | | | | | | F Horanský S Stakhovsky | 6 | 6 |
| WC | Peter Naď Peter Benjamín Privara | 5 | $7^7$ | [10] | | | | | | | | | | | 2 | D Molchanov A Nedovyesov | 4 | 4 |
| | D Ajduković D Džumhur | 7 | $6^2$ | [8] | WC | P Naď PB Privara | 3 | 3 | | | | | | | | | | |
| | S Balaji D Sharan | 6 | 6 | | | S Balaji D Sharan | 6 | 6 | | | | | | | | | | |
| 3 | D Pel S Verbeek | 3 | 4 | | | | | | | | S Balaji D Sharan | 2 | 3 | | | | | |
| WC | Krištof Minárik Lukáš Palovič | 3 | 3 | | | | | | | 2 | D Molchanov A Nedovyesov | 6 | 6 | | | | | |
| | S Martos Gornés R Ramanathan | 6 | 6 | | | S Martos Gornés R Ramanathan | 4 | 4 | | | | | | | | | | |
| | | | | | 2 | D Molchanov A Nedovyesov | 6 | 6 | | | | | | | | | | |
