Singles
2011 St. Petersburg Open
Final
Champion	Marin Čilić
Runner-up	Janko Tipsarević
Score	6–3, 3–6, 6–2
Events
Singles Doubles
← 2010 · St. Petersburg Open · 2012 →

Mikhail Kukushkin was the defending champion but lost to Michael Berrer in the first round.

Marin Čilić won the tournament beating Janko Tipsarević in the final, 6–3, 3–6, 6–2.

	Semifinals							Final
	5	Mikhail Youzhny	3	4
	4	Marin Čilić	6	6
								4	Marin Čilić	6	3	6
								2	Janko Tipsarević	3	6	2
	7	Alex Bogomolov Jr.	2	1
	2	Janko Tipsarević	6	6

	First round							Second round							Quarterfinals							Semifinals
	1	G Simon	6	4	4
		A Mannarino	2	6	6				A Mannarino	6	77
	WC	E Gulbis	3	4					L Rosol	2	65
		L Rosol	6	6												A Mannarino	2	3
		P Riba	2	1											5	M Youzhny	6	6
		J Benneteau	6	6					J Benneteau	4	6	2
		S Stakhovsky	3	67				5	M Youzhny	6	3	6
	5	M Youzhny	6	79																		5	M Youzhny	3	4
	4	M Čilić	6	77																		4	M Čilić	6	6
	Q	S Bubka	4	61				4	M Čilić	5	6	6
		S Devvarman	6	6					S Devvarman	7	1	3
		K Beck	2	3											4	M Čilić	4	710	6
	Q	V Pospisil	5	64												A Seppi	6	68	4
		A Seppi	7	77					A Seppi	3	6	6
		I Andreev	3	6	77				I Andreev	6	2	4
	6	M Granollers	6	4	64

	First round							Second round							Quarterfinals							Semifinals
	7	A Bogomolov Jr.	6	6
		I Kunitsyn	3	1				7	A Bogomolov Jr.	6	3	7
		C Berlocq	7	3	1				P Kohlschreiber	4	6	5
		P Kohlschreiber	64	6	6										7	A Bogomolov Jr.	6	6
	SE	J Chardy	4	4											Q	D Lajović	2	1
	Q	D Lajović	6	6				Q	D Lajović	2	6	6
	WC	D Sela	6	6				WC	D Sela	6	2	1
	3	A Dolgopolov	2	2																		7	A Bogomolov Jr.	2	1
	8	D Tursunov	7	6																		2	J Tipsarević	6	6
	Q	T Gabashvili	5	3				8	D Tursunov	2	4
		P Starace	6	6					P Starace	6	6
	WC	I Nedelko	0	1												P Starace	78	2	1
		M Kukushkin	1	6	4										2	J Tipsarević	66	6	6
		M Berrer	6	4	6				M Berrer	3	0r
		O Rochus	2	5				2	J Tipsarević	6	2
	2	J Tipsarević	6	7

• Main Draw
• Qualifying Draw