JUNIOR welterweight Derek `Teacher’ McKenzie lost a six-round contest to England’s Peter Ahmed on June 9, 1982. The fight was held at the Locarno Ballroom in Bristol, England and Ahmed was leading on points when the final bell sounded. 

It was the first of two fights between the two. In November of the same year the 25-year-old McKenzie also lost by points to Ahmed. McKenzie had left Guyana early in his career to reside in the United Kingdom and campaigned mostly there, but would return home for his final fight.
McKenzie had a rare victory on February 14, 1983, following a decision over Englishman Delroy Pearce at the Concert Hall in London, England. The victory was the third in 11 fights for the Guyanese who had taken up residence in Fulham, England.
He drew against Winfield Braithwaite on his professional debut in 1979. His second time in the ring ended in a defeat at the hands Trinidadian Michael Parsons in the Twin Island Republic. McKenzie claimed his first professional scalp in the third fight.
In May of 1980 the `Teacher’ gave Clifford `Piggy’ Griffith a lesson to win the 10-rounder on points but lost the next five successive fights, one being to Lloyd Honeyghan. McKenzie had his last of 15 professional fights on June 15, 1986 when he suffered a TKO in round eight to a youthful Marcelle Daniels.