Swimmer specializing in the breaststroke who won five FINA World Aquatics Championships from 2009 to 2017. She medaled for Russia at the Olympic Games in 2012 and 2016.
She grew up in the Russian cities of Volgodonsk and Taganrog. She attended Southern Federal University before moving to California.
Her career has been marred by doping scandals, having had several medals and world records invalidated.
She has been coached by her father, Andrey Yefimov.
She competed against swimmers like Lilly King at the 2016 Summer Olympics.