2022 Keio Challenger

Country	Player	Rank1	Seed
AUS	Christopher O'Connell	100	1
AUS	John Millman	142	2
JPN	Kaichi Uchida	168	3
BIH	Damir Džumhur	180	4
TPE	Wu Tung-lin	207	5
JPN	Hiroki Moriya	213	6
JPN	Yosuke Watanuki	223	7
CZE	Zdeněk Kolář	235	8

• ¹ Rankings are as of 24 October 2022.[1]

The following players received wildcards into the singles main draw:

• Tomoya Fujiwara
• Shinji Hazawa
• Masamichi Imamura

The following players received entry into the singles main draw using protected rankings:

• Tatsuma Ito
• Yūichi Sugita

The following players received entry from the qualifying draw:

• Hong Seong-chan
• Taisei Ichikawa
• Yuki Mochizuki
• Jonathan Mridha
• Ryota Tanuma
• James Trotter

The following player received entry as a lucky loser:

• Rimpei Kawakami

Country	Player	Rank1	Seed
KOR	Han Na-lae	185	1
JPN	Mai Hontama	260	2
JPN	Kyōka Okamura	304	3
JPN	Himeno Sakatsume	305	4
JPN	Sakura Hosogi	316	5
THA	Luksika Kumkhum	330	6
JPN	Haruka Kaji	337	7
JPN	Chihiro Muramatsu	348	8

• ¹ Rankings are as of 31 October 2022.

The following players received wildcards into the singles main draw:

• Anri Nagata
• Remika Ohashi
• Suzuho Oshino
• Karen Tsutsumi

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

• Ayano Shimizu

The following players received entry from the qualifying draw:

• Erina Hayashi
• Aoi Ito
• Miyu Kato
• Natsumi Kawaguchi
• Honoka Kobayashi
• Michika Ozeki
• Himari Sato
• Eri Shimizu

The following players received entry as a lucky loser:

• Yuka Hosoki

• Christopher O'Connell def. Yosuke Watanuki 6–1, 6–7^(5–7), 6–3.

• Han Na-lae def. Miyu Kato, 7–5, 6–0

• Victor Vlad Cornea / Ruben Gonzales def. Tomoya Fujiwara / Masamichi Imamura 7–5, 6–3.

• Saki Imamura / Naho Sato def. Han Na-lae / Mai Hontama, 6–4, 4–6, [10–5]