Lucas Pouille defeated Feliciano López in the final, 4–6, 7–6^(7–5), 6–4 to win the singles tennis title at the 2017 Stuttgart Open.^[1] Pouille saved a match point en route to the title, in the second round against Jan-Lennard Struff.

Dominic Thiem was the reigning champion, but chose not to participate this year.

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

	Semifinals							Final
	6	Mischa Zverev	77	64	5
		Feliciano López	62	77	7
									Feliciano López	6	65	4
								4/WC	Lucas Pouille	4	77	6
	4/WC	Lucas Pouille	77	7
		Benoît Paire	65	5

	First round							Second round							Quarterfinals							Semifinals
								1	R Federer	6	68	4
	WC	T Haas	6	4	7			WC	T Haas	2	710	6
		P-H Herbert	3	6	5										WC	T Haas	4	4
	Q	Y Hanfmann	6	7											6	M Zverev	6	6
	Q	M Fucsovics	3	5				Q	Y Hanfmann	61	2
		M Jaziri	3	1				6	M Zverev	77	6
	6	M Zverev	6	6																		6	M Zverev	77	64	5
																							F López	62	77	7
								3	T Berdych	77	6
		S Robert	1	7	2				B Tomic	64	2
		B Tomic	6	5	6										3	T Berdych	77	3	4
		F Mayer	63	6	61											F López	64	6	6
		J Chardy	77	4	77				J Chardy	3	6	2
		F López	6	6					F López	6	3	6
	7	G Simon	3	3

	First round							Second round							Quarterfinals							Semifinals
	5	S Johnson	3	77	6
	WC	M Marterer	6	62	4			5	S Johnson	63	7	66
		M Baghdatis	1	0r					P Kohlschreiber	77	5	78
		P Kohlschreiber	6	0												P Kohlschreiber	4	6	3
	Q	L Lacko	4	63											4/WC	L Pouille	6	2	6
		J-L Struff	6	77					J-L Struff	6	65	68
								4/WC	L Pouille	4	77	710
																						4/WC	L Pouille	77	7
	8	V Troicki	4	4																			B Paire	65	5
		B Paire	6	6					B Paire	6	6
		N Basilashvili	6	3	1			Q	P Gojowczyk	2	4
	Q	P Gojowczyk	2	6	6											B Paire	6	77
		A Kuznetsov	4	6	3										PR	J Janowicz	1	64
	PR	J Janowicz	6	3	6			PR	J Janowicz	77	6
								2	G Dimitrov	64	3

	First round							Qualifying competition
	1	Lukáš Lacko	6	6
		Daniel Brands	3	4
								1	Lukáš Lacko	6	7
								6	Alexander Bublik	3	5
		Mirza Bašić	5	3
	6	Alexander Bublik	7	6

	First round							Qualifying competition
	2	Ruben Bemelmans	1	6	77
		Yasutaka Uchiyama	6	3	64
								2	Ruben Bemelmans	4	64
								5	Peter Gojowczyk	6	77
		Daniel Masur	7	3	2
	5	Peter Gojowczyk	5	6	6

	First round							Qualifying competition
	Alt	Yannick Hanfmann	6	2	6
		Lukáš Rosol	3	6	4
								Alt	Yannick Hanfmann	6	6
								WC	Yannick Maden	4	1
	WC	Yannick Maden	7	5	6
	8	Vincent Millot	5	7	1

	First round							Qualifying competition
	4	Taylor Fritz	5	6	3
		Marco Chiudinelli	7	4	6
									Marco Chiudinelli	5	5
								7	Márton Fucsovics	7	7
	WC	Daniel Altmaier	3	4
	7	Márton Fucsovics	6	6

• Main draw
• Qualifying draw