Masahiro Iwasaki is a Brazilian jiu-jitsu black belt under Marco Barbosa (as well as a former student of Yasuhiro Miyamoto) who is regarded as one of the top Japanese grappling competitors of his generation; known also as a member of the prestigious Tokyo based academy Carpe Diem. As a black belt Masahiro Iwasaki conquered medals in the IBJJF European International Open, IBJJF Asian Open as well as at the ASJJF All Japan Championship.