FILE — In this Dec. 4, 2015, file photo, Yulia Efimova swims фото (photo)

FILE — In this Dec. 4, 2015, file photo, Yulia Efimova swims in the women's 100-meter breaststroke during a preliminary race in the U.S. Winter Nationals swimming event in Federal Way, Wash. World champion Efimova has been provisionally suspended on suspicion of breaking anti-doping rules. The suspension makes breaststroke specialist Efimova, who has won four world titles and an Olympic bronze medal, the latest high-profile name caught up in the series of doping scandals that have dogged Russia over the last two years. (AP Photo/Elaine Thompson, File)