This study investigates the multiplicity of South Korean Major League Baseball fans, with a focus on the tensions that they experience under the nationalistic aura surrounding MLB fandom while pursuing their individual hobby. For this purpose, it employs the idea of "post-Westernization" to interpret baseball as a global sport and examine its recent popularity in South Korea. By exploring the activities and voices of an online community among Korean fans, it demonstrates how national desires were complicated when they collided with a global strategy during the first World Baseball Classic in 2006. Analysis of Korean MLB fans during the WBC indicates both the possibilities and the limits of global baseball as a case of post-Westernization. The study shows that becoming an MLB fan in South Korea is at the intersection of national identity (nationalist fervor for MLB), regional rivalry (against Japan, the former colonizer) and global sensibilities (American sport fandom). Korean fans’ responses can be summarized as the national-regional-global nexus in which they perceive the existence of regional and global hierarchies, but they also routinely contest their own and each others’ perceptions. Finally, it suggests that fans’ articulation of the national, regional, and global are far from being fixed or unidirectional: they are constantly under construction.