Roger Federer was the defending champion,^[1] but chose not to participate this year.

Gaël Monfils won the title, defeating Stan Wawrinka in the final, 6–3, 1–6, 6–2. This was Wawrinka's first final in any ATP Tour event since the 2017 French Open.

	Semifinals							Final
	1	Kei Nishikori	2	6	4
	WC	Stan Wawrinka	6	4	6
								WC	Stan Wawrinka	3	6	2
									Gaël Monfils	6	1	6
		Gaël Monfils	4	6	6
	5	Daniil Medvedev	6	3	4

	First round							Second round							Quarterfinals							Semifinals
	1	K Nishikori	3	6	6
	SE	P-H Herbert	6	1	4			1	K Nishikori	6	6
	LL	M Copil	2	4				LL	E Gulbis	1	4
	LL	E Gulbis	6	6											1	K Nishikori	6	6
		M Kližan	64	4												M Fucsovics	3	2
		M Fucsovics	77	6					M Fucsovics	77	6
		H Chung	6	61	2			9	N Basilashvili	61	1
	9	N Basilashvili	4	77	6																	1	K Nishikori	2	6	4
	4	M Raonic	710	7																		WC	S Wawrinka	6	4	6
		P Kohlschreiber	68	5				4	M Raonic	4	64
		B Paire	64	1				WC	S Wawrinka	6	77
	WC	S Wawrinka	77	6											WC	S Wawrinka	6	77
	Q	G Simon	68	4											10	D Shapovalov	4	64
	WC	T Berdych	710	6				WC	T Berdych	4	3
	Q	F Škugor	5	3				10	D Shapovalov	6	6
	10	D Shapovalov	7	6

	First round							Second round							Quarterfinals							Semifinals
	8	D Goffin	65	5
		G Monfils	77	7					G Monfils	4	6	6
		A Seppi	77	3	6				A Seppi	6	1	3
	Q	P Gojowczyk	63	6	2											G Monfils	6	6
		M Kukushkin	6	77												D Džumhur	1	2
		R Haase	2	64					M Kukushkin	4	63
		D Džumhur	6	1	7				D Džumhur	6	77
	3	S Tsitsipas	4	6	5																		G Monfils	4	6	6
	5	D Medvedev	77	6																		5	D Medvedev	6	3	4
		J Chardy	62	2				5	D Medvedev	6	7
		M Ebden	5	4					F Verdasco	2	5
		F Verdasco	7	6											5	D Medvedev	6	6
	PR	J-W Tsonga	6	6											PR	J-W Tsonga	4	2
	Q	T Fabbiano	1	4				PR	J-W Tsonga	77	6
	WC	T Griekspoor	3	6	6			WC	T Griekspoor	65	1
	2	K Khachanov	6	3	2

	First round							Qualifying competition
								1	Gilles Simon	77	77
								7	Ernests Gulbis	62	62
		Sergiy Stakhovsky	3	4
	7	Ernests Gulbis	6	6

	First round							Qualifying competition
	2	Jan-Lennard Struff	4	4
	WC	Ryan Nijboer	6	6
								WC	Ryan Nijboer	6	2	4
								Alt	Franko Škugor	4	6	6
	Alt	Franko Škugor	77	6
	6	Ilya Ivashka	64	0

	First round							Qualifying competition
	3	Marius Copil	63	77	77
	WC	Scott Griekspoor	77	62	61
								3	Marius Copil	5	6	65
								8	Thomas Fabbiano	7	3	77
	WC	Jelle Sels	1	62
	8	Thomas Fabbiano	6	77

	First round							Qualifying competition
	4	Peter Gojowczyk	79	6
		Evgeny Donskoy	67	4
								4	Peter Gojowczyk	6	62	6
									Andrey Rublev	4	77	2
		Andrey Rublev	77	64	6
	5	Denis Kudla	64	77	2

• Main draw
• Qualifying draw