Jun Kasai
When RINGS collapsed in 2002, Sakata participated in PRIDE Fighting Championships fights and joined Pro Wrestling Zero-One as a freelancer. His wrestling ventures increased over time, and he finally joined Zero-One full-time. Sakata started teaming up with fellow RINGS wrestler Hirotaka Yokoi, but his greatest highlights came from his solo career, winning the Tenka-Ichi Junior Tournament after big wins over Ikuto Hidaka, Low Ki, Dick Togo and Naohiro Hoshikawa. The tournament gained him the vacant WORLD-1 Junior Heavyweight Championship, and he later defeated Low Ki again for the NWA/UPW/Zero-One International Junior Heavyweight Championship, which solidified his status as the new junior ace of the company. However, after retaining his double championship before Jun Kasai, Hidaka and Homicide, he shocked pundits by vacating it and moving up to heavyweight division. Though a tough perspective, it wasn't fruitless, as Sakata won the NWA Intercontinental Tag Team Championship with Masato Tanaka from Shinjiro Otani and Takao Omori.