Shun Yamaguchi (山口 俊, Yamaguchi Shun; born July 11, 1987) is a Japanese former professional baseball pitcher. He played in Nippon Professional Baseball (NPB) for the Yokohama BayStars/Yokohama DeNA BayStars and Yomiuri Giants, and in Major League Baseball (MLB) for the Toronto Blue Jays. He is the first Japanese player to make his MLB debut with the Blue Jays, and also the first MLB player who had never played for any baseball teams in the United States. All previous Japanese players who were on the Blue Jays had already debuted for other MLB teams.
Source: “Shun Yamaguchi”, English Wikipedia (CC BY-SA 4.0), excerpt