Barreto made his MMA debut in 1996 and won experienced Russian fighter
Mikhail Ilyukhin. In 1996 he took part in Universal Vale Tudo Fighting 6 grand prix. He won
Dan Bobish in semifinal, and
Kevin Randleman in final. After that tournament he made his
UFC debut and took part in
UFC 15 4 fighters heavyweight tournament. He was defeated by
Dave Beneteau. After victoires over
Branden Lee Hinkle and Pedro Otavio Barreto Barreto met
Igor Vovchanchyn at
Pride 6 and loss fight by split decision. After defeating Gary Myers he fought second time in
Pride and defeated
Tra Telligman via TKO . In 2000 he made debut in
Rings and lost to
Chris Haseman. 2001 -st year was not successful, Barreto lost fights to
Gilbert Yvel and
Ian Freeman. In 2002 Barreto hold victories over Marcelo Souza and
Ben Rothwell. Then he met
Travis Wiuff and loss fight. Next opponent was
Bobby Hoffman and Barreto won that fight. After three consecutive loss Barreto retired from competition. ==Black House (MMA) ==