As a boxer Dokiwari was a late comer to the sport. He did not lace a pair of gloves until months after his eighteenth birthday. Within a span of 5 years from 1991 through 1996 Dokiwari rose from a virtually unknown in Nigerian boxing circle to become the country's foremost amateur boxing star. Dokiwari won the prestigious Eagle Belt champion of champions title consecutively between 1994 and 1995 in Lagos, Nigeria. Between 1993 through 1996 Duncan was Nigerian super heavyweight champion.