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The 2019 St. Petersburg Open was a tennis tournament played on indoor hard courts. It was the 24th edition of the St. Petersburg Open, and part of the ATP Tour 250 Series of the 2019 ATP Tour. It took place at the Sibur Arena in Saint Petersburg, Russia, from September 16 through 22, 2019.^[1]

Singles main-draw entrants

Country	Player	Rank¹	Seed
RUS	Daniil Medvedev	4	1
RUS	Karen Khachanov	9	2
ITA	Matteo Berrettini	13	3
CRO	Borna Ćorić	15	4
RUS	Andrey Rublev	37	5
KAZ	Mikhail Kukushkin	56	6
FRA	Adrian Mannarino	59	7
NOR	Casper Ruud	60	8

The following players received wildcards into the singles main draw:

The following players received entry using a protected ranking into the main draw:

The following players received entry from the qualifying draw:

The following players received entry as lucky losers:

Country	Player	Country	Player	Rank¹	Seed
CRO	Nikola Mektić	CRO	Franko Škugor	50	1
BEL	Sander Gillé	BEL	Joran Vliegen	94	2
CZE	Roman Jebavý	AUT	Philipp Oswald	106	3
BRA	Marcelo Demoliner	NED	Matwé Middelkoop	114	4

The following pairs received wildcards into the doubles main draw:

Divij Sharan / Igor Zelenay def. Matteo Berrettini / Simone Bolelli, 6–3, 3–6, [10–8]