Doubles
2013 Keio Challenger
Final
Champions	Bradley Klahn Michael Venus
Runners-up	Sanchai Ratiwatana Sonchat Ratiwatana
Score	7–5, 6–1
Events
Singles Doubles
← 2012 · Keio Challenger · 2014 →

Prakash Amritraj and Philipp Oswald were the defending champions but chose not to compete.
Bradley Klahn and Michael Venus defeated second seeds Sanchai Ratiwatana and Sonchat Ratiwatana 7–5, 6–1.

	First round							Quarterfinals							Semifinals							Final
	1	M Draganja M Pavić	3	610
	Alt	T Matsui D Udomchoke	6	712				Alt	T Matsui D Udomchoke	6	3	[9]
		T Chen E López-Pérez	6	7					T Chen E López-Pérez	3	6	[11]
	WC	Koki Takada Takashi Yano	1	5												T Chen E López-Pérez	3	63
	3	F Moser M Reid	3	2												B Klahn M Venus	6	77
		C Buchanan B Rola	6	6					C Buchanan B Rola	6	4	[8]
		B Klein T-h Yang	3	4					B Klahn M Venus	4	7	[10]
		B Klahn M Venus	6	6																			B Klahn M Venus	7	6
	WC	Yoshifumi Inoue Kweon Dae-yang	3	64																		2	Sa Ratiwatana So Ratiwatana	5	1
		H-h Lee H-y Peng	6	77					H-h Lee H-y Peng	4	3
		R Gonzales A Sitak	6	6					R Gonzales A Sitak	6	6
	4	J Cerretani A Shamasdin	0	1												R Gonzales A Sitak	2	2
	WC	T Ito Y Uchiyama	6	6											2	Sa Ratiwatana So Ratiwatana	6	6
		M Bašić G Gigounon	1	1				WC	T Ito Y Uchiyama	5	62
	PR	D Kosakowski J Wang	2	65				2	Sa Ratiwatana So Ratiwatana	7	77
	2	Sa Ratiwatana So Ratiwatana	6	77

• Main Draw