KEY POINTS:
Zimbabwe's Olympic champion Kirsty Coventry set a world record in the 200m backstroke with a time of 2m 6.39s at the Missouri Grand Prix on Saturday.
The 24-year-old Coventry, who lives and trains in the United States, broke the previous mark set by Hungary's Krisztina Egerszegi in August 1991 by 0.23s.
Coventry, who won the gold medal in the women's 200m backstroke at the Athens Olympics in 2004, finished more than 4s ahead of second-placed American Margaret Hoelzer who clocked 2m 10.76s.
