Roberto Satoshi made the most of the first MMA fights to be held inside the historic Tokyo Dome, earning the lightweight title at RIZIN 28.
Satoshi finished Tofiq Musayev with a triangle choke in just 72 seconds, capturing the belt.
The card also featured wins by Kai Asakura, Naoki Inoue, Hiromasa Ougikubo and Yuki Motoya in the bantamweight grand prix.
Complete results, courtesy MMA Fighting, can be found below:
Kleber Koike def. Mikuru Asakura via submission (triangle choke) – Round 2, 1:49
Tenshin Nasukawa vs. Koki Osaki, Hiroya Kawabe, and Hideo Tokoro — no official result announced
Roberto Satoshi def. Tofiq Musayev via submission (triangle choke) – Round 1, 1:12
Kai Asakura def. Shooto Watanabe via TKO – Round 1, 3:22 in bantamweight GP opening round
Naoki Inoue def. Shintaro Ishiwatari via KO – Round 1, 2:01 in bantamweight GP opening round
Hiromasa Ougikubo def. Takeshi Kasugai via unanimous decision in bantamweight GP opening round
Yuki Motoya def. Ryo Okada via unanimous decision in bantamweight GP opening round
Yutaka Saito def. Vugar Karamov via split decision
Shoma Shibisai def. Tsuyoshi Sudario via submission (rear-naked choke) – Round 3, 1:39
Satoshi Yamasu def. Noah Bey via split decision