Frazer has already been successful internationally as a junior. At the Track Junior World Championships in 1990 in Plovdiv, she won the gold medal with the Jamaican 4 x 100 meters relay. This track defended two years later at the IAAF World Junior Championships in 1992 in Seoul, where she also in the 100 -meter run and the 200 -meter run won the bronze medal.
In the course of her career, she was especially successful as a relay runner. With the 4 x 100 meters relay she won at the World Athletics Championships 1997 in Athens, the silver medal at the 1999 World Championships in Seville, 2001 in Edmonton each bronze. In addition, she was a member of the Jamaican sprint relay, which in Sydney was second at the 2000 Olympic Games. Frazer himself, however, was only used in the qualifying rounds. Merlene Ottey In the final, took her place on the anchor leg.
Frazer's greatest success as a single starter was winning the bronze medal in the 200 - meter race at the World Athletics Championships in 1999. She reached the destination at the same time the German Andrea Philip, which was first performed on the fourth. After a protest by the German Athletics Association two bronze medals were awarded. Other notable results achieved Frazer in 200 -meter run as the Fourth Hallenenweltmeisterschaften in Paris in 1997 and as of the Second IAAF Grand Prix Finals in Munich in 1999 and in the 400 -meter run as a semi-final participant at the 1996 Olympic Games in Atlanta.
Merlene Frazer is 1,74 m tall and had a competition weight of 63 kg.