2025 BOSS Open – Singles

Singles
2025 BOSS Open
Champion	Taylor Fritz
Runner-up	Alexander Zverev
Score	6–3, 7–6(7–0)
Draw	28 (4 Q / 3 WC )
Seeds	8

Taylor Fritz defeated Alexander Zverev in the final, 6–3, 7–6^(7–0) to win the singles tennis title at the 2025 Stuttgart Open.^[1] He won the title without losing a set or having his serve broken during the tournament. It was Fritz's fourth grass court title, and ninth ATP Tour singles title overall.

Jack Draper was the reigning champion,^[2] but did not participate this year.

At 17 years and eight months old, Justin Engel was the second-youngest player since 1990 to win a tour-level match (excluding Davis Cup) on three surfaces, after Rafael Nadal.^[3] He became the youngest quarterfinalist in the tournament's history and the youngest at any grass-court tournament since Boris Becker at the 1985 Wimbledon Championships.^[4]

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

	Semifinals							Final
	1	Alexander Zverev	710	77
	3	Ben Shelton	68	61
								1	Alexander Zverev	3	60
								2	Taylor Fritz	6	77
	4	Félix Auger-Aliassime	4	65
	2	Taylor Fritz	6	77

	First round							Second round							Quarterfinals							Semifinals
								1	A Zverev	6	79
	WC	F Fognini	4	77	3				C Moutet	2	67
		C Moutet	6	63	6										1	A Zverev	7	6
		L Tien	63	77	0										6	B Nakashima	5	4
		Y Nishioka	77	63	0r				L Tien	65	3
		J Fearnley	6	64	1			6	B Nakashima	77	6
	6	B Nakashima	4	77	6																	1	A Zverev	710	77
																						3	B Shelton	68	61
								3	B Shelton	77	7
		D Džumhur	4	0r				Q	P-H Herbert	64	5
	Q	P-H Herbert	6	3											3	B Shelton	6	6
		M Arnaldi	4	4											8	J Lehečka	4	4
	WC	J-L Struff	6	6				WC	J-L Struff	4	5
		B Bonzi	4	4				8	J Lehečka	6	7
	8	J Lehečka	6	6

	First round							Second round							Quarterfinals							Semifinals
	7	A Michelsen	6	4	6
		G Monfils	4	6	3			7	A Michelsen	4	4
	WC	J Engel	4	6	77			WC	J Engel	6	6
	Q	J Duckworth	6	4	65										WC	J Engel	63	3
		R Safiullin	610	6	5										4	F Auger-Aliassime	77	6
		G Mpetshi Perricard	712	3	7				G Mpetshi Perricard	4	4
								4	F Auger-Aliassime	6	6
																						4	F Auger-Aliassime	4	65
	5	D Shapovalov	4	6	0																	2	T Fritz	6	77
		A Rinderknech	6	2	6				A Rinderknech	64	3
	Q	Y Hanfmann	5	4				Q	M Fucsovics	77	6
	Q	M Fucsovics	7	6											Q	M Fucsovics	3	4
		Q Halys	66	7	6										2	T Fritz	6	6
		L Sonego	78	5	4				Q Halys	3	66
								2	T Fritz	6	78

	First round							Qualifying competition
	1	James Duckworth	6	77
		Benjamin Hassan	3	64
								1	James Duckworth	64	77	6
								5	Nikoloz Basilashvili	77	65	3
		Hugo Grenier	6	611	2
	5	Nikoloz Basilashvili	2	713	6

	First round							Qualifying competition
	2	Eliot Spizzirri	4	5
		Li Tu	6	7
									Li Tu	3	77	1
								7	Pierre-Hugues Herbert	6	62	6
	Alt	Maximilian Marterer	1	1
	7	Pierre-Hugues Herbert	6	6

	First round							Qualifying competition
	3	Tristan Boyer	65	79	77
		Duje Ajduković	77	67	65
								3	Tristan Boyer	612	4
								6	Yannick Hanfmann	714	6
	WC	Max Wiskandt	4	2
	6	Yannick Hanfmann	6	6

	First round							Qualifying competition
	4	Márton Fucsovics	6	62	7
	WC	Patrick Zahraj	4	77	5
								4	Márton Fucsovics	65	6	6
									Beibit Zhukayev	77	3	2
		Beibit Zhukayev	6	5	6
	8	Marc-Andrea Hüsler	3	7	4

• Main draw
• Qualifying draw