Singles
2012 All Japan Indoor Tennis Championships
Champion	Tatsuma Ito
Runner-up	Malek Jaziri
Score	6–7(5–7), 6–1, 6–2

Dominik Meffert was the defending champion but decided not to participate.
Tatsuma Ito won the title, defeating Malek Jaziri 6–7^(5–7), 6–1, 6–2 in the final.

Seeds

Draw

Finals

	Semifinals							Final
		Hiroki Moriya	4	2
	3	Tatsuma Ito	6	6
								3	Tatsuma Ito	65	6	6
								2	Malek Jaziri	77	1	2
		Samuel Groth	62	3
	2	Malek Jaziri	77	6

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	G Soeda	6	6
	Q	P Raja	4	4				1	G Soeda	69	1
	WC	Y Uchiyama	5	1					Hiroki Moriya	711	6
		Hiroki Moriya	7	6												Hiroki Moriya	6	5	77
		S Rieschick	6	6												S Rieschick	4	7	65
		A Weintraub	4	4					S Rieschick	6	6
		Z Zhang	1	6	3			6	T-h Yang	2	0
	6	T-h Yang	6	3	6																		Hiroki Moriya	4	2
	3	T Ito	77	7																		3	T Ito	6	6
		J Lemke	62	5				3	T Ito	3	6	6
		R Klaasen	64	78	4			Q	M Barton	6	4	0
	Q	M Barton	77	66	6										3	T Ito	77	64	6
		Y Bhambri	6	6												Y Bhambri	65	77	3
		C Niland	1	3					Y Bhambri	3	6	6
	WC	T Niki	5	3				5	D Udomchoke	6	4	2
	5	D Udomchoke	7	6

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	8	H Heliövaara	7	6
	WC	Shota Tagawa	5	4				8	H Heliövaara	4	6	65
		S Groth	1	6	7				S Groth	6	4	77
	Q	B Klein	6	3	5											S Groth	77	712
		Y-k Lim	3	4											4	Y Sugita	64	610
	WC	T Suzuki	6	5r					Y-k Lim	5	2
		T Chen	63	3				4	Y Sugita	7	6
	4	Y Sugita	77	6																			S Groth	62	3
	7	B Mitchell	7	2	4																	2	M Jaziri	77	6
		J Wang	5	6	6				J Wang	6	2	6
		J Millman	69	5					K Čapkovič	1	6	3
		K Čapkovič	711	7												J Wang	6	4	3
		Michael Look	6	77											2	M Jaziri	0	6	6
	Q	Y Chu-huan	4	64					M Look	5	5
		D Molchanov	79	65	0			2	M Jaziri	7	7
	2	M Jaziri	67	77	6

References

• Main Draw
• Qualifying Draw