BARCELONA - Yuliya Efimova of Russia set a world record of 29.78 in the women's 50 metres breaststroke in the morning heats at the World Championship.
Efimova, 21, broke the old world mark of 29.80 set by American Rebecca Soni at US Open in 2009.
World record evolution (Time, Name/Nationality, Place, Date):
29.78 Yuliya Efimova RUS Barcelona 03.08.13
29.90 Jessica Jardy USA Federal Way 07.08.09
29.95 Jessica Hardy USA Federal Way 06.08.09
30.09 Yuliya Efimova RUS Rome 02.08.09
30.23 Amanda Reason CAN Montreal 08.07.09