Lithuanian teenager Ruta Meilutyte won the 100 metres breaststroke gold at the world championships in Barcelona on Tuesday, with a time just outside the world record she set in Monday's qualifying.
Yuliya Efimova of Russia set a world record in the 50 metres breaststroke and Australia's Cate Campbell left her rivals for 50 freestyle gold trailing in qualifying at the world championships in Barcelona on Saturday.
American Jessica Hardy kept the world records flowing at the world short-course championships with a sparkling victory in the women's 50 metres breaststroke on Thursday. Hardy, who won the world long-course title in 2007, clocked 29.58 seconds to beat the 29.90 set by Australia's Jade Edmistone in Brisbane in 2004. It took the world record tally to four after three marks tumbled on Wednesday's opening night.
Russia's Yuliya Efimova followed up Friday's world championship gold medal in the women's 200 metres breaststroke by setting a world record in the 50 metres version of the event in her heat on Saturday.
Olympic champion Ruta Meilutyte of Lithuania set a European and world championship record in the heats for the 100 metres breaststroke in Barcelona on Monday.
Swimming's top nations are setting their sights on how to deal with midnight finishes during the Rio 2016 Olympics.