2018 St. Petersburg Open – Singles

Damir Džumhur was the defending champion, but lost in the quarterfinals to Stan Wawrinka.

Singles
2018 St. Petersburg Open
Champion	Dominic Thiem
Runner-up	Martin Kližan
Score	6–3, 6–1
Draw	28 (4 Q / 3 WC )
Seeds	8

Main article: 2018 St. Petersburg Open

Dominic Thiem won the title after defeating Martin Kližan 6–3, 6–1 in the final. Notably, this was Kližan's first defeat in a deciding match, after 10 consecutive titles at ATP World Tour level.

The tournament marked the last appearance of Mikhail Youzhny in professional tennis.^[1]

Seeds

The top four seeds receive a bye into the second round.

1. Dominic Thiem (champion)
2. Fabio Fognini (second round)
3. Marco Cecchinato (quarterfinals)
4. Karen Khachanov (second round)
5. Roberto Bautista Agut (semifinals)
6. Damir Džumhur (quarterfinals)
7. Denis Shapovalov (quarterfinals)
8. Daniil Medvedev (quarterfinals)

Draw

Key

• Q = Qualifier
• WC = Wild card
• LL = Lucky loser
• Alt = Alternate
• ITF = ITF entry
• PR = Protected ranking
• SR = Special ranking
• SE = Special exempt
• JE = Junior exempt
• JR = Junior Accelerator Programme entrant
• CO = College Accelerator Programme entrant
• NG = Next Gen Accelerator Program entrant
• w/o = Walkover
• r = Retired
• d = Defaulted

Finals

	Semifinals							Final
	1	Dominic Thiem	6	6
	5/WC	Roberto Bautista Agut	4	3
								1	Dominic Thiem	6	6
									Martin Kližan	3	1
	WC	Stan Wawrinka	6	3	5
		Martin Kližan	4	6	7

Top half

	First round							Second round							Quarterfinals							Semifinals
								1	D Thiem	77	6
		A Rublev	4	66					J-L Struff	64	4
		J-L Struff	6	78											1	D Thiem	6	3	77
		M Kukushkin	7	2											8	D Medvedev	2	6	62
		D Istomin	5	4r					M Kukushkin	3	4
		J Sousa	4	1				8	D Medvedev	6	6
	8	D Medvedev	6	6																		1	D Thiem	6	6
																						5/WC	R Bautista Agut	4	3
								3	M Cecchinato	7	78
	LL	R Bemelmans	2	6	5				L Lacko	5	66
		L Lacko	6	4	7										3	M Cecchinato	60	3
		M Bašić	66	4											5/WC	R Bautista Agut	77	6
	WC	M Youzhny	78	6				WC	M Youzhny	66	6	3
	Q	L Vanni	5	2				5/WC	R Bautista Agut	78	3	6
	5/WC	R Bautista Agut	7	6

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	6	D Džumhur	7	6
	Q	L Miedler	5	3				6	D Džumhur	6	6
	Q	I Ivashka	6	3	4				G Pella	4	4
		G Pella	4	6	6										6	D Džumhur	3	4
		A Bedene	5	65											WC	S Wawrinka	6	6
	WC	S Wawrinka	7	77				WC	S Wawrinka	712	77
								4	K Khachanov	610	61
																						WC	S Wawrinka	6	3	5
	7	D Shapovalov	77	6																			M Kližan	4	6	7
	Q	A Menéndez Maceiras	63	2				7	D Shapovalov	78	4	6
		G García López	65	6	3				M Berrettini	66	6	0
		M Berrettini	77	2	6										7	D Shapovalov	6	5	3
		E Donskoy	4	4												M Kližan	3	7	6
		M Kližan	6	6					M Kližan	6	6
								2	F Fognini	3	4

Qualifying

Seeds

1. Lorenzo Sonego (first round)
2. Ilya Ivashka (qualified)
3. Ruben Bemelmans (qualifying competition, lucky loser)
4. Viktor Troicki (first round)
5. Adrián Menéndez Maceiras (qualified)
6. Stéphane Robert (first round)
7. Luca Vanni (qualified)
8. Alexey Vatutin (first round)

Qualifiers

1. Luca Vanni
2. Ilya Ivashka
3. Adrián Menéndez Maceiras
4. Lucas Miedler

Lucky loser

1. Ruben Bemelmans

Qualifying draw

First qualifier

	First round							Qualifying competition
	1	Lorenzo Sonego	6	4	5
	WC	Roman Safiullin	3	6	7
								WC	Roman Safiullin	4	4
								7	Luca Vanni	6	6
		Daniel Brands	4	6	5
	7	Luca Vanni	6	4	7

Second qualifier

	First round							Qualifying competition
	2	Ilya Ivashka	2	78	6
	Alt	Evgeny Karlovskiy	6	66	4
								2	Ilya Ivashka	77	77
								WC	Evgenii Tiurnev	64	63
	WC	Evgenii Tiurnev	6	6
	6	Stéphane Robert	3	4

Third qualifier

	First round							Qualifying competition
	3	Ruben Bemelmans	6	4	77
	PR	Egor Gerasimov	2	6	64
								3	Ruben Bemelmans	6	2	3
								5	Adrián Menéndez Maceiras	4	6	6
		Ivan Nedelko	2	3
	5	Adrián Menéndez Maceiras	6	6

Fourth qualifier

	First round							Qualifying competition
	4	Viktor Troicki	2	3
		Lucas Miedler	6	6
									Lucas Miedler	7	6
									Uladzimir Ignatik	5	2
		Uladzimir Ignatik	7	6
	8	Alexey Vatutin	5	4