Tokyo: ‘Diamond Diplomacy’ Doc Tracks the History of Baseball in Japan and Its Impact on U.S. Relations

*Diamond Diplomacy* explores 150 years of Japan-US relations through baseball, tracing how the sport became part of Japanese life and a point of cultural exchange. Directed by Yuriko Gamo Romer, the documentary connects baseball’s history to geopolitics, race and the experiences of Japanese-Americans, showing how the game has carried meanings beyond sport.

The film follows baseball’s introduction to Japan in 1872, Babe Ruth’s 1934 tour, Japanese-American games in wartime internment camps and the arrival of Japanese players in Major League Baseball. It features Masanori Murakami, the first Japanese player in MLB, and considers the significance of Negro League tours in Japan. More than half of a $600,000 US humanities grant was cancelled in April 2025; former diplomat Glen S. Fukushima contributed $300,000 to help complete the film.