Ekaterina Alexandrova defeated Dayana Yastremska in the final, 6–2, 3–6, 7–5 to win the singles title at the 2025 Upper Austria Ladies Linz.^[1] It was her fifth WTA Tour singles title.^[2]

Jeļena Ostapenko was the reigning champion,^[3] but chose not to defend her title.

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

	Semifinals							Final
	1/WC	Karolína Muchová	0	4
	4	Ekaterina Alexandrova	6	6
								4	Ekaterina Alexandrova	6	3	7
								5	Dayana Yastremska	2	6	5
	5	Dayana Yastremska	6	6
	8	Clara Tauson	1	4

	First round							Second round							Quarterfinals							Semifinals
								1/WC	K Muchová	6	6
		L Sun	3	3				Q	S Sorribes Tormo	2	3
	Q	S Sorribes Tormo	6	6											1/WC	K Muchová	6	3	6
		R Šramková	7	7											6	A Potapova	3	6	3
		E Cocciaretto	5	5					R Šramková	61	4
	WC	J Grabher	2	2				6	A Potapova	77	6
	6	A Potapova	6	6																		1/WC	K Muchová	0	4
																						4	E Alexandrova	6	6
								4	E Alexandrova	6	6
	Q	A Sasnovich	6	77				Q	A Sasnovich	3	2
	Q	A Zakharova	3	63											4	E Alexandrova	3	6	6
	WC	E Lys	4	7	3										Q	P Martić	6	2	2
	Q	P Martić	6	5	6			Q	P Martić	6	4	7
		K Siniaková	3	2				7	E Avanesyan	4	6	5
	7	E Avanesyan	6	6

	First round							Second round							Quarterfinals							Semifinals
	5	D Yastremska	78	7
		L Bronzetti	66	5				5	D Yastremska	7	6
		M Sherif	3	4				Q	A Ružić	5	1
	Q	A Ružić	6	6											5	D Yastremska	7	6
		V Tomova	79	6											3	M Sakkari	5	0
		J Bouzas Maneiro	67	4					V Tomova	3	2
								3	M Sakkari	6	6
																						5	D Yastremska	6	6
	8	C Tauson	6	6																		8	C Tauson	1	4
		A Kalinina	3	3				8	C Tauson	6	6
		S Cîrstea	5	6	6				S Cîrstea	2	4
		A Rus	7	2	3										8	C Tauson	6	6
	Q	S Kraus	63	2												A Blinkova	4	3
		A Blinkova	77	6					A Blinkova	6	6
								2	E Svitolina	4	4

	First round							Qualifying competition
	1	Suzan Lamens	6	6
	WC	Tamara Kostic	0	0
								1	Suzan Lamens	2	6	3
								8	Sara Sorribes Tormo	6	0	6
		Tamara Korpatsch	4	5
	8	Sara Sorribes Tormo	6	7

	First round							Qualifying competition
	2	Greet Minnen	6	6
		Rebeka Masarova	4	2
								2	Greet Minnen	0	65
								10	Anastasia Zakharova	6	77
	WC	Mavie Österreicher	3	62
	10	Anastasia Zakharova	6	77

	First round							Qualifying competition
	3	Anna Bondár	3	3
		Aliaksandra Sasnovich	6	6
									Aliaksandra Sasnovich	7	4	6
								12	Ella Seidel	5	6	4
		Céline Naef	2	4
	12	Ella Seidel	6	6

	First round							Qualifying competition
	Alt	Lola Radivojević	3	2
		Jodie Burrage	6	6
									Jodie Burrage	4	61
									Antonia Ružić	6	77
		Antonia Ružić	6	6
	9	Anca Todoni	3	1

	First round							Qualifying competition
	5	Zeynep Sönmez	6	6
		Lucrezia Stefanini	3	3
								5	Zeynep Sönmez	4	3
								11	Petra Martić	6	6
	WC	Liel Marlies Rothensteiner	4	1
	11	Petra Martić	6	6

	First round							Qualifying competition
	6	Viktorija Golubic	6	6
		Ysaline Bonaventure	3	0
								6	Viktorija Golubic	63	6	3
								WC	Sinja Kraus	77	4	6
	WC	Sinja Kraus	6	6
	7	Nuria Párrizas Díaz	1	2

• Main draw
• Qualifying draw