Singles
2021 Saint Petersburg Challenger II
Champion	Evgenii Tiurnev
Runner-up	Kacper Żuk
Score	6–4, 6–2

Zizou Bergs was the defending champion^[1] but lost in the second round to Kacper Żuk.

Evgenii Tiurnev won the title after defeating Żuk 6–4, 6–2 in the final.

Seeds

Draw

Finals

	Semifinals							Final
	WC	Evgenii Tiurnev	77	6
	4	Marius Copil	64	2
								WC	Evgenii Tiurnev	6	6
								6	Kacper Żuk	4	2
	6	Kacper Żuk	79	6
	Q	Jiří Lehečka	67	3

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	R Safiullin	4	67
	Q	M Bašić	6	79				Q	M Bašić	6	77
		R Ortega Olmedo	6	6					R Ortega Olmedo	1	63
		R Quiroz	3	3											Q	M Bašić	4	2
		V Kopřiva	4	2											WC	E Tiurnev	6	6
	WC	E Tiurnev	6	6				WC	E Tiurnev	6	2	6
		A Çelikbilek	6	6					A Çelikbilek	3	6	3
	8	T Gabashvili	2	2																		WC	E Tiurnev	77	6
	4	M Copil	6	6																		4	M Copil	64	2
	Alt	M Vrbenský	3	1				4	M Copil	5	6	6
		D-h Lee	6	1	1				A Vatutin	7	3	1
		A Vatutin	0	6	6										4	M Copil	77	7
		D Ajduković	7	6											7	C Eubanks	61	5
		Shuichi Sekiguchi	5	2					D Ajduković	3	3
	Alt	J de Jong	5	4				7	C Eubanks	6	6
	7	C Eubanks	7	6

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	6	K Żuk	6	6
		I Sijsling	4	3				6	K Żuk	1	6	6
	SE	Z Bergs	6	6				SE	Z Bergs	6	4	3
		P Krstin	2	1											6	K Żuk	6	6
		P Kotov	6	6												J Sock	3	2
	Q	T van Rijthoven	2	4					P Kotov	4	3
		J Sock	5	6	6				J Sock	6	6
	3	C İlkel	7	4	4																	6	K Żuk	79	6
	5	R Molleker	6	7																		Q	J Lehečka	67	3
		E Karlovskiy	3	5				5	R Molleker	2	3
	Q	J Lehečka	6	77				Q	J Lehečka	6	6
	Q	M Pecotić	2	64											Q	J Lehečka	6	6
	WC	D Yevseyev	6	6											2	D Popko	4	4
	WC	V Uzakov	0	0				WC	D Yevseyev	4	6	4
		N Serdarušić	4	4				2	D Popko	6	2	6
	2	D Popko	6	6

References

External links

• Main draw
• Qualifying draw