Singles
2021 Saint Petersburg Challenger
Champion	Zizou Bergs
Runner-up	Altuğ Çelikbilek
Score	6–4, 3–6, 6–4

This was the first edition of the tournament.^[1]

Zizou Bergs won the title after defeating Altuğ Çelikbilek 6–4, 3–6, 6–4 in the final.

Seeds

Draw

Finals

	Semifinals							Final
		Altuğ Çelikbilek	5	6	6
	Q	Artem Dubrivnyy	7	2	3
									Altuğ Çelikbilek	4	6	4
								Q	Zizou Bergs	6	3	6
	Q	Zizou Bergs	79	6
		Vít Kopřiva	67	2

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	R Safiullin	5	4
	WC	E Tiurnev	7	6				WC	E Tiurnev	3	3
		J de Jong	6	4	6				J de Jong	6	6
		U Ignatik	4	6	3											J de Jong	67	0
		A Çelikbilek	6	6												A Çelikbilek	79	6
		K Sultanov	4	1					A Çelikbilek	6	77
		N Serdarušić	4	6	0			6	A Vatutin	3	63
	6	A Vatutin	6	3	6																		A Çelikbilek	5	6	6
	3	R Molleker	62	4																		Q	A Dubrivnyy	7	2	3
		V Durasovic	77	6					V Durasovic	5	6	3
		I Sijsling	6	4	3			Q	A Dubrivnyy	7	3	6
	Q	A Dubrivnyy	3	6	6										Q	A Dubrivnyy	6	68	6
		M Pecotić	60	2											Q	A Kuznetsov	3	710	3
	Q	A Kuznetsov	77	6				Q	A Kuznetsov	6	6
		M Bašić	6	6					M Bašić	1	1
	8	E Karlovskiy	0	4

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	5	T Gabashvili	4	2
		P Kotov	6	6					P Kotov	0	5
	Q	Z Bergs	6	6				Q	Z Bergs	6	7
		H Bourchier	4	2											Q	Z Bergs	6	6
		M Ebden	6	6											Q	L Catarina	3	4
		P Krstin	1	4					M Ebden	64	2
	Q	L Catarina	7	6				Q	L Catarina	77	6
	4	C Eubanks	5	2																		Q	Z Bergs	79	6
	7	R Quiroz	6	6																			V Kopřiva	67	2
		D-h Lee	2	2				7	R Quiroz	2	4
	WC	I Gakhov	5	6	67				V Kopřiva	6	6
		V Kopřiva	7	1	79											V Kopřiva	7	6
	WC	D Stricker	5	6	6										2	C İlkel	5	2
		D Ajduković	7	4	2			WC	D Stricker	77	3	3
		Shuichi Sekiguchi	3	2				2	C İlkel	65	6	6
	2	C İlkel	6	6

References

External links

• Main draw
• Qualifying draw