2025 Keio Challenger

The 2025 Yokohama Keio Challenger was a professional tennis tournament played on hardcourts. It was the 18th (men's) and 8th (women's) editions of the tournament and part of the 2025 ATP Challenger Tour and the 2025 ITF Women's World Tennis Tour. It took place in Yokohama, Japan between 17 and 30 November 2025.

• ¹ Rankings are as of 10 November 2025.^[1]

The following players received wildcards into the singles main draw:

• Masamichi Imamura
• Lennon Roark Jones
• Ryo Tabata

The following player received entry into the singles main draw through the Junior Accelerator programme:

• Kaylan Bigun

The following players received entry from the qualifying draw:

• Taisei Ichikawa
• Yusuke Kusuhara
• Igor Marcondes
• Ryotaro Taguchi
• Michael Vrbenský
• Jumpei Yamasaki

• ¹ Rankings are as of 17 November 2025.^[2]

The following players received wildcards into the singles main draw:

• Yuno Kitahara
• Anri Nagata
• Yuka Naito
• Naho Sato

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

• Darya Astakhova

The following players received entry from the qualifying draw:

• Mayuka Aikawa
• Ena Koike
• Jana Kolodynska
• Rinko Matsuda
• Kristiana Sidorova
• Wang Yuhan
• Cody Wong
• Zhang Ying

• Rei Sakamoto def. Kaichi Uchida 4–6, 7–6^(7–4), 6–4.

• Zhang Shuai def. Ku Yeon-woo 6–3, 6–2.

• Neil Oberleitner / Michael Vrbenský def. Masamichi Imamura / Ryuki Matsuda 7–6^(8–6), 6–1.

• Dang Yiming / You Xiaodi def. Natsumi Kawaguchi / Hayu Kinoshita 2–6, 6–3, [10–4].