This article examines professional boxing as a compelling and dynamic example of globalization from below between 1890 and 1914. It explores the sport's fluctuating legal and organizational status and maps the movement of professional boxers – and the networks that facilitated this movement – across the anglophone world. Boxing was particularly suited to cross-national mobility because it developed alongside, and built upon, the global circuits of the late nineteenth-century entertainment industry. Yet the main sites of the anglophone boxing world were not connected in any structured or standardized fashion. Channels of communication and routes of traffic were continually shifting, with no one city, region or nation emerging as a consistent hub of activity. This article explores boxing's fluid, multiple and loosely structured ‘networks’, and shows how the sport remained largely resistant to international regulation and standardization in this period.