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Men's doubles
2018 Keio Challenger
Final
Champions	Tobias Kamke Tim Pütz
Runners-up	Sanchai Ratiwatana Sonchat Ratiwatana
Score	3–6, 7–5,
Events
Singles men women Doubles men women
← 2017 · Keio Challenger · 2019 →

Marin and Tomislav Draganja were the defending champions but chose not to defend their title.

Tobias Kamke and Tim Pütz won the title after defeating Sanchai and Sonchat Ratiwatana 3–6, 7–5, in the final.

Seeds

1. Sanchai Ratiwatana / Sonchat Ratiwatana (final)
2. Sriram Balaji / Yasutaka Uchiyama (first round)
3. Peng Hsien-yin / Andreas Siljeström (quarterfinals)
4. Toshihide Matsui / Yi Chu-huan (quarterfinals)

Draw

Key

• Q = Qualifier
• WC = Wild card
• LL = Lucky loser
• Alt = Alternate
• SE = Special exempt
• PR = Protected ranking
• ITF = ITF entry
• JE = Junior exempt
• w/o = Walkover
• r = Retired
• d = Defaulted
• SR = Special ranking

	First round							Quarterfinals							Semifinals							Final
	1	Sa Ratiwatana So Ratiwatana	6	6
	WC	S Hazawa M Imamura	3	4				1	Sa Ratiwatana So Ratiwatana	6	7
		Z Li S Robert	6	4					M Purcell A Whittington	3	5
		M Purcell A Whittington	3	6											1	Sa Ratiwatana So Ratiwatana	5	6
	4	T Matsui C-h Yi	6	2											WC	T Ito K Uesugi	7	2
	Q	M Donati E Leshem	1	1				4	T Matsui C-h Yi	7	5
	WC	T Ito K Uesugi	6	6				WC	T Ito K Uesugi	6	7
	WC	Masahiro Fukuda Eiji Yamasaki	2	3																		1	Sa Ratiwatana So Ratiwatana	6	5
		T Altuna H Hurkacz	4	2																			T Kamke T Pütz	3	7
		C Rungkat Ze Zhang	6	6					C Rungkat Ze Zhang	6	6
		B Klein L Margaroli	7	6				3	H-y Peng A Siljeström	2	2
	3	H-y Peng A Siljeström	6	7												C Rungkat Ze Zhang	3	3
		M Gong C-p Hsieh	6	7												T Kamke T Pütz	6	6
		T Chen J Jung	3	6					M Gong C-p Hsieh	6	6
		T Kamke T Pütz	6	6					T Kamke T Pütz	7	7
	2	S Balaji Y Uchiyama	4	3

References

• Main draw
• Qualifying draw

• 2018 Keio Challenger