2018 Keio Challenger

Country	Player	Rank1	Seed
AUS	Jordan Thompson	95	1
AUS	John Millman	103	2
TPE	Jason Jung	153	3
JPN	Go Soeda	156	4
FRA	Stéphane Robert	158	5
KOR	Kwon Soon-woo	180	6
JPN	Tatsuma Ito	181	7
KOR	Lee Duck-hee	190	8

• ¹ Rankings are as of 19 February 2018.

The following players received wildcards into the singles main draw:

• Shinji Hazawa
• Kaito Itsusaki
• Kaito Uesugi
• Yosuke Watanuki

The following player received entry into the singles main draw as a special exempt:

• Blake Ellis

The following players received entry from the qualifying draw:

• Chung Yun-seong
• Hiroyasu Ehara
• Hiroki Moriya
• Jumpei Yamasaki

The following player received entry as a lucky loser:

• Daniel Nguyen

Country	Player	Rank1	Seed
JPN	Eri Hozumi	180	1
JPN	Junri Namigata	196	2
JPN	Miharu Imanishi	197	3
ITA	Georgia Brescia	202	4
GBR	Laura Robson	218	5
TUR	Ayla Aksu	226	6
RUS	Veronika Kudermetova	227	7
CHN	Lu Jiajing	232	8

• ¹ Rankings are as of 26 February 2018.

The following players received wildcards into the singles main draw:

• Ayumi Hirata
• Marina Kurosu
• Megumi Nishimoto
• Satoko Sueno

The following players received entry from the qualifying draw:

• Harriet Dart
• Misa Eguchi
• Mai Hontama
• Momoko Kobori
• Lee Ya-hsuan
• Ma Yexin
• Katherine Sebov
• Moyuka Uchijima

• Yasutaka Uchiyama def. Tatsuma Ito 2–6, 6–3, 6–4.

• Veronika Kudermetova def. Harriet Dart, 6–2, 6–4

• Tobias Kamke / Tim Pütz def. Sanchai Ratiwatana / Sonchat Ratiwatana 3–6, 7–5, [12–10].

• Laura Robson / Fanny Stollár def. Momoko Kobori / Chihiro Muramatsu, 5–7, 6–2, [10–4]