Singles
2018 Japan Women's Open
Champion	Hsieh Su-wei
Runner-up	Amanda Anisimova
Score	6–2, 6–2

Zarina Diyas was the defending champion, but lost in the quarterfinals to Zhang Shuai.

Hsieh Su-wei won her first title in six years, beating Amanda Anisimova in the final 6–2, 6–2.

Seeds

Draw

Finals

	Semifinals							Final
	1	Zhang Shuai	64	5
	Q	Amanda Anisimova	77	7
								Q	Amanda Anisimova	2	2
								2	Hsieh Su-wei	6	6
	4	Wang Qiang	4	4
	2	Hsieh Su-wei	6	6

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	S Zhang	7	6
		M Fręch	5	3				1	S Zhang	6	77
	WC	N Hibino	6	6				WC	N Hibino	4	64
		E Bouchard	4	4											1	S Zhang	6	7
		K Kozlova	6	6											6	Z Diyas	4	5
	Q	Y Zhang	2	3					K Kozlova	77	2	5
		S Sorribes Tormo	2	1				6	Z Diyas	63	6	7
	6	Z Diyas	6	6																		1	S Zhang	64	5
	3	Y Putintseva	2	0r																		Q	A Anisimova	77	7
		AK Schmiedlová	6	0					AK Schmiedlová	5	7	6
		V Golubic	0	6	77				V Golubic	7	5	3
	WC	M Doi	6	3	61											AK Schmiedlová	3	1
		J Fett	1	1											Q	A Anisimova	6	6
	Q	A Anisimova	6	6				Q	A Anisimova	6	6
		A Riske	5	4				7	S Zheng	1	1
	7	S Zheng	7	6

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	8	M Linette	6	6
		J Larsson	4	1				8	M Linette	6	77
		T Zidanšek	6	6					T Zidanšek	3	63
	Q	Ar Rodionova	2	4											8	M Linette	2	2
		Y Duan	7	2	2										4	Q Wang	6	6
		L Kumkhum	5	6	6				L Kumkhum	5	3
	Q	P Hon	6	1	3			4	Q Wang	7	6
	4	Q Wang	3	6	6																	4	Q Wang	4	4
	5	A Tomljanović	6	6																		2	S-w Hsieh	6	6
		F Ferro	4	1				5	A Tomljanović	7	6
	WC	M Kato	63	2					L Zhu	5	4
		L Zhu	77	6											5	A Tomljanović	6	2	0
	PR	M Minella	6	6											2	S-w Hsieh	4	6	6
		K Nara	3	4				PR	M Minella	3	2
		P Hercog	6	1	3			2	S-w Hsieh	6	6
	2	S-w Hsieh	4	6	6

Qualifying

Qualifying draw

First qualifier

	First round							Second round							Qualifying competition
	1	Amanda Anisimova	6	6
		Momoko Kobori	3	3
								1	Amanda Anisimova	6	3	6
								WC	Urszula Radwańska	1	6	4
	WC	Urszula Radwańska	79	6
		Miharu Imanishi	67	1
															1	Amanda Anisimova	6	6
															Alt	Hiroko Kuwata	3	2
	Alt	Hiroko Kuwata	6	63	6
		Mai Minokoshi	1	77	3
								Alt	Hiroko Kuwata	6	7
								5	Harriet Dart	4	5
	WC	Makoto Ninomiya	2	77	2
	5	Harriet Dart	6	65	6

Second qualifier

	First round							Second round							Qualifying competition
	2	Antonia Lottner	3	4
		Zhang Yuxuan	6	6
									Zhang Yuxuan	6	7
									Valeria Savinykh	3	5
		Zhang Kailin	3	7	4
		Valeria Savinykh	6	5	6
																Zhang Yuxuan	4	6	6
															8	Jang Su-jeong	6	3	1
		Junri Namigata	2	3
		Danielle Lao	6	6
									Danielle Lao	5	3
								8	Jang Su-jeong	7	6
		Ellen Perez	6	3	3
	8	Jang Su-jeong	3	6	6

Third qualifier

	First round							Second round							Qualifying competition
	3	Arina Rodionova	6	0
		Eri Hozumi	0	0r
								3	Arina Rodionova	3	6	7
								WC	Chihiro Muramatsu	6	4	5
		Risa Ozaki	4	6	3
	WC	Chihiro Muramatsu	6	3	6
															3	Arina Rodionova	3	6	6
																Sílvia Soler Espinosa	6	2	3
		Anna Zaja	6	6
		Dejana Radanović	4	3
									Anna Zaja	3	4
									Sílvia Soler Espinosa	6	6
		Sílvia Soler Espinosa	6	7
	6	Danka Kovinić	4	5

Fourth qualifier

	First round							Second round							Qualifying competition
	4	Han Xinyun	6	6
	WC	Shuko Aoyama	4	1
								4	Han Xinyun	67	5
									Varvara Flink	79	7
		Jaimee Fourlis	5	2
		Varvara Flink	7	6
																Varvara Flink	3	2
															7	Priscilla Hon	6	6
		Liang En-shuo	6	5	4
		Han Na-lae	3	7	6
									Han Na-lae	2	2
								7	Priscilla Hon	6	6
		Deniz Khazaniuk	3	65
	7	Priscilla Hon	6	77

References

• Main Draw
• Qualifying Draw