Mirko Filipovic Croatian kickboxing legend Mirko Filipovic and Brazilian superstar Wanderlei Silva are among the confirmed participants for an upcoming RIZIN FF open-weight grand prix. Former PRIDE head and current RIZIN FF boss Nobuyuki Sakakibara announced the Japanese promotion’s plans, with the tournament kicking off on Sept. 25 at Saitama Super Arena in Saitama, Japan. Four of the 16 tournament participants, including Filipovic and Silva, will receive a bye in the opening round and will automatically advance to the tournament’s quarterfinal round, which is scheduled for Dec