Cape Town - South Africa's Cameron van der Burgh has failed to qualify for the semi-finals of the 200m breaststroke at the Fina World Championship in Kazan, Russia.
Swimming in his least-favourite breaststroke distance, Van der Burgh finished eighth in his heat and posted the 21st-quickest time overall of 2:12.37.
Compatriot Ayrton Sweeney fared even worse, finished 10th and last in his heat and recorded the 33rd-fastest time overall of 2:14.98.
Van der Burgh did at least have the satisfaction of finishing ahead of Great Britain's Adam Peaty who had beaten Van der Burgh to the gold medal in both the 50m and 100m breaststroke earlier in the championship.
Peaty posted the 26th-fastest time of 2:13.24.