Russian Yuliya Efimova broke the women's 50m breaststroke world record at the world championships in Barcelona on Saturday.
Efimova clocked 29.78 seconds in the heats to better the previous mark of 29.80 set by American Jess Hardy in 2009.
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Efimova breaks 50m breaststroke record
Russian Yuliya Efimova has broken the women's 50m breaststroke world record at the world championships in Barcelona.
