The Waseda–Keio rivalry (早慶戦, Sōkeisen), also known as the Waseda–KO rivalry, is a college rivalry between two universities located in Tokyo, Japan: Waseda University and Keio University. Waseda University also has a close relationship with Meiji University, and the sports competition between these two universities is known as Someisen. These schools are regarded as the most prestigious private universities in Japan. The rivalry dates back to the introduction of baseball in Japan during the Meiji period (1868–1912).^[1] In Keio University, it is called Keisōsen, too. In the 20th century, the Waseda–Keio rivalry served as a model for the Korea University-Yonsei University rivalry.^[2]

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