The Marathon Grand Championship (MGC) is a prestigious marathon selection event organized by the Japan Association of Athletics Federations. This event serves as a crucial platform for determining Japan's representatives for the Olympic marathon, with the next MGC series set to commence in March 2025. The MGC operates under a competitive series format that inherits the principles of the former JMC series, culminating in the selection of the annual marathon champion for Japan. Participants accumulate points based on their performances in affiliated domestic marathons, which ultimately leads to selection for international competitions.

The 2028 Los Angeles Olympic marathon selection is intricately linked to the MGC series, with athletes needing to meet specific criteria to be considered for representation. The MGC not only identifies the fastest athletes but also those with the strongest prospects, employing the MGC Fast Pass and Final Challenge as key qualifiers. With a focus on excellence and competitive spirit, the MGC series promises an exhilarating journey for marathon enthusiasts and athletes alike, emphasizing the importance of determination and achievement in the sport.