2018 Shimadzu All Japan Indoor Tennis Championships

Country	Player	Rank1	Seed
AUS	John Millman	103	1
AUS	Jordan Thompson	107	2
JPN	Go Soeda	161	3
FRA	Stéphane Robert	162	4
JPN	Tatsuma Ito	181	5
KOR	Kwon Soon-woo	184	6
POL	Hubert Hurkacz	219	7
JPN	Yasutaka Uchiyama	222	8

• ¹ Rankings are as of 12 February 2018.

The following players received wildcards into the singles main draw:

• Sora Fukuda
• Shintaro Imai
• Yuta Shimizu
• Yosuke Watanuki

The following player received entry into the singles main draw using a protected ranking:

• Michał Przysiężny

The following players received entry from the qualifying draw:

• Blake Ellis
• Takanyi Garanganga
• Yuya Kibi
• Li Zhe

• John Millman def. Jordan Thompson 7–5, 6–1.

• Luke Saville / Jordan Thompson def. Go Soeda / Yasutaka Uchiyama 6–3, 5–7, [10–6].