Singles
2018 Shimadzu All Japan Indoor Tennis Championships
Champion	John Millman
Runner-up	Jordan Thompson
Score	7–5, 6–1

Yasutaka Uchiyama was the defending champion but lost in the first round to Michał Przysiężny.

John Millman won the title after defeating Jordan Thompson 7–5, 6–1 in the final.

Seeds

Draw

Finals

	Semifinals							Final
	1	John Millman	6	6
	Q	Blake Ellis	3	4
								1	John Millman	7	6
								2	Jordan Thompson	5	1
		Tim Pütz	6	5	4
	2	Jordan Thompson	3	7	6

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	J Millman	6	6
		D Wu	4	4				1	J Millman	77	66	6
		B Klein	6	3	77				B Klein	63	78	3
		Ze Zhang	3	6	65										1	J Millman	4	6	6
		M Purcell	6	6											7	H Hurkacz	6	3	2
		M Banes	4	4					M Purcell	1	4
	Q	Yuya Kibi	5	3				7	H Hurkacz	6	6
	7	H Hurkacz	7	6																		1	J Millman	6	6
	3	G Soeda	78	0	77																	Q	B Ellis	3	4
	WC	Y Watanuki	66	6	62			3	G Soeda	6	6
		A Whittington	6	6					A Whittington	4	1
	WC	Sora Fukuda	3	3											3	G Soeda	3	7	5
		Y Takahashi	77	4	4										Q	B Ellis	6	5	7
	Q	B Ellis	64	6	6			Q	B Ellis	4	6	6
	WC	Y Shimizu	2	3				5	T Ito	6	3	4
	5	T Ito	6	6

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	8	Y Uchiyama	6	4	63
	PR	M Przysiężny	4	6	77			PR	M Przysiężny	3	4
		T Kamke	6	6					T Kamke	6	6
		E Leshem	2	2												T Kamke	4	0
		C İlkel	3	2												T Pütz	6	6
		T Pütz	6	6					T Pütz	77	6
		P Gunneswaran	6	1	6				P Gunneswaran	65	2
	4	S Robert	3	6	4																		T Pütz	6	5	4
	6	S-w Kwon	6	77																		2	J Thompson	3	7	6
		M Donati	4	65				6	S-w Kwon	4	712	67
		K Uchida	6	3					K Uchida	6	610	79
	Q	T Garanganga	4	1r												K Uchida	65	0
		K Kravchuk	6	7											2	J Thompson	77	6
	WC	Shintaro Imai	4	5					K Kravchuk	3	1
	Q	Z Li	6	64	4			2	J Thompson	6	6
	2	J Thompson	4	77	6

References

• Main Draw
• Qualifying Draw