Doubles
2021 Slovak Open II
Champions	Filip Horanský Sergiy Stakhovsky
Runners-up	Denys Molchanov Aleksandr Nedovyesov
Score	6–4, 6–4

Harri Heliövaara and Emil Ruusuvuori were the defending champions^[1] 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

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							Quarterfinals							Semifinals							Final
								1	R Jebavý J O'Mara	63	3
		Z Kolář J Lehečka	66	77	[7]				F Horanský S Stakhovsky	77	6
		F Horanský S Stakhovsky	78	64	[10]											F Horanský S Stakhovsky	65	77	[14]
	4	S Walków J Zieliński	6	3	[5]											F Ferreira Silva E Kırkın	77	62	[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	77	[10]																	2	D Molchanov A Nedovyesov	4	4
		D Ajduković D Džumhur	7	62	[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

References

• Main draw