Singles
2013 Keio Challenger
Champion	Matthew Ebden
Runner-up	Go Soeda
Score	2–6, 7–6(7–3), 6–3

Matteo Viola was the defending champion but chose not to compete. Matthew Ebden won his third Challenger of the year over Japan's Go Soeda.

Seeds

Draw

Finals

	Semifinals							Final
	1	Matthew Ebden	6	6
	4	Bradley Klahn	3	1
								1	Matthew Ebden	2	77	6
								3	Go Soeda	6	63	3
	3	Go Soeda	6	6
	6	Pierre-Hugues Herbert	4	4

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	M Ebden	6	3	6
		M Bašić	0	6	2			1	M Ebden	6	6
		H Moriya	6	6					H Moriya	1	3
		M Reid	3	2											1	M Ebden	6	6
		B Rola	64	4												J Wang	4	4
		B Mitchell	77	6					B Mitchell	62	0
		J Wang	6	3					J Wang	77	6
	7	Y Sugita	4	1r																		1	M Ebden	6	6
	4	B Klahn	6	6																		4	B Klahn	3	1
		L-C Huang	1	3				4	B Klahn	6	7
		D Wu	6	5	6				D Wu	1	5
		J McGee	3	7	2										4	B Klahn	4	6	6
	PR	D Kosakowski	2	1											8	T Ito	6	3	4
	Q	H Chung	6	6				Q	H Chung	2	3
		T Daniel	5	3				8	T Ito	6	6
	8	T Ito	7	6

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	5	J Duckworth	3	5
		K Coppejans	6	7					K Coppejans	6	1	2
		M Chiudinelli	6	7					M Chiudinelli	4	6	6
	Q	Y Uchiyama	4	5												M Chiudinelli	4	4
	WC	Masato Shiga	6	4	2										3	G Soeda	6	6
	Q	C Buchanan	3	6	6			Q	C Buchanan	1	1
	WC	K Uchida	2	4				3	G Soeda	6	6
	3	G Soeda	6	6																		3	G Soeda	6	6
	6	P-H Herbert	6	6																		6	P-H Herbert	4	4
	WC	Y Nishioka	3	2				6	P-H Herbert	77	6
		E López-Pérez	4	6	6				E López-Pérez	65	4
	Q	Shuichi Sekiguchi	6	4	2										6	P-H Herbert	2	6	79
		G Gigounon	2	2											WC	B Ćorić	6	3	67
	WC	B Ćorić	6	6				WC	B Ćorić	w/o
		J Ward	4	1				2	B Kavčič
	2	B Kavčič	6	6

References

• Main Draw
• Qualifying Draw