Koji Uehara is a Japanese former professional baseball pitcher. He played for the Yomiuri Giants of Nippon Professional Baseball (NPB), as well as the Baltimore Orioles, Texas Rangers, Boston Red Sox, and Chicago Cubs of Major League Baseball (MLB).

The Yomiuri Giants are a Japanese professional baseball team competing in Nippon Professional Baseball's Central League. Based in Bunkyo, Tokyo, they are one of two professional baseball teams based in Tokyo, the other being the Tokyo Yakult Swallows. They have played their home games in the Tokyo Dome since its opening in 1988. The team's owner is Yomiuri Shimbun Holdings, Japan's largest media conglomerate which also owns two newspapers and the Nippon Television Network.