K-1 WORLD GP 2017: Super Welterweight Championship Tournament: The new K-1 has left Yoyogi, which has been held since its launch, and moved to Saitama Super Arena. The first memorable event will be hosting a super welterweight tournament, which is said to be the most layered in the world. How did the four Japanese national team players compete against the powerful overseas teams who have shown strength in past tournaments? It also includes all-out battles in which champions from K-1 weight classes such as Gao, Louis, Takeru, and Taiga also participated.