Ashlyn Krueger defeated Zhu Lin in the final, 6–3, 7–6^(8–6) to win the singles title at the 2023 Japan Women's Open. It was her first WTA Tour title.^[1]

Nao Hibino was the defending champion from when the tournament was last held in 2019, but lost in the first round to Rebecca Marino.^[2]

	Semifinals							Final
	1	Zhu Lin	7	78
	3	Wang Xinyu	5	66
								1	Zhu Lin	3	66
									Ashlyn Krueger	6	78
		Ashlyn Krueger	6	6
	WC	Mai Hontama	3	3

	First round							Second round							Quarterfinals							Semifinals
	1	L Zhu	6	6
		Xiy Wang	4	4				1	L Zhu	6	4	6
	WC	M Uchijima	6	6				WC	M Uchijima	4	6	1
	Q	A Raina	4	2											1	L Zhu	6	6
	Q	E Mandlik	7	6											Q	E Mandlik	3	2
		D Parry	5	2				Q	E Mandlik	7	3	6
		R Marino	6	6					R Marino	5	6	1
	7	N Hibino	3	4																		1	L Zhu	7	78
	3	Xin Wang	77	6																		3	Xin Wang	5	66
		J Teichmann	63	3				3	Xin Wang	6	6
	Q	H Sakatsume	6	6				Q	H Sakatsume	4	2
	Q	A Eala	0	3											3	Xin Wang	77	61	6
	Q	V Savinykh	6	1	6										6	Y Putintseva	64	77	3
		A-L Friedsam	4	6	3			Q	V Savinykh	1	2
		D Shnaider	2	3				6	Y Putintseva	6	6
	6	Y Putintseva	6	6

	First round							Second round							Quarterfinals							Semifinals
	8	K Baindl	2	3
		A Krueger	6	6					A Krueger	6	6
		V Golubic	4	2					J Ponchet	4	1
		J Ponchet	6	6												A Krueger	6	6
		J Niemeier	4	4												A Kalinskaya	3	1
		A Kalinskaya	6	6					A Kalinskaya	77	6
		H Dart	7	5	6				H Dart	65	2
	4	L Fruhvirtová	5	7	2																		A Krueger	6	6
	5	N Podoroska	6	3	7																	WC	M Hontama	3	3
		Y Yuan	4	6	5			5	N Podoroska	3	3
	WC	M Hontama	7	0	6			WC	M Hontama	6	6
		S-j Jang	5	6	2										WC	M Hontama	62	6	6
	Q	A Hartono	6	3	6										Q	A Hartono	77	4	1
	WC	M Doi	2	6	3			Q	A Hartono	6	6
		P Udvardy	2	6	77				P Udvardy	2	0
	2	T Maria	6	4	65

	First round							Qualifying competition
	1	Elizabeth Mandlik	2	6	6
		Yang Ya-yi	6	3	2
								1	Elizabeth Mandlik	6	6
								10	Haruka Kaji	1	2
		Kyōka Okamura	4	6	2
	10	Haruka Kaji	6	4	6

	First round							Qualifying competition
	2	Valeria Savinykh	78	6
	WC	Aoi Ito	66	1
								2	Valeria Savinykh	6	6
									Carol Zhao	3	2
		Carol Zhao	7	6
	12	Han Na-lae	5	2

	First round							Qualifying competition
	3	Ankita Raina	6	7
	WC	Yuki Naito	3	5
								3	Ankita Raina	2
									Kateryna Volodko	1r
		Kateryna Volodko	6	6
	11	Sakura Hosogi	3	1

	First round							Qualifying competition
	4	Despina Papamichail	6	64	6
		Naiktha Bains	4	77	0
								4	Despina Papamichail	1	5
								7	Arianne Hartono	6	7
		Sofya Lansere	4	6	2
	7	Arianne Hartono	6	3	6

	First round							Qualifying competition
	5	Alexandra Eala	6	6
		Fernanda Contreras	3	4
								5	Alexandra Eala	4	6	7
									Park So-hyun	6	1	5
		Park So-hyun	6	5
	8	You Xiaodi	3	1r

	First round							Qualifying competition
	6	Himeno Sakatsume	6	6
	WC	Natsumi Kawaguchi	3	3
								6	Himeno Sakatsume	6	5	6
								9	Eudice Chong	3	7	0
	WC	Momoko Kobori	4	68
	9	Eudice Chong	6	710

• Main draw
• Qualifying draw