Russian rhythmic gymnast Yana Kudryavtseva, who won 13 world championships from 2013 to 2015, has retired from the sport aged 19. Kudryavtseva, who suffered a fracture while preparing for Rio Olympics, won a silver in all-around gymnastics at Rio. She also became the youngest rhythmic gymnast to win the World Championships, winning the all-around category in 2013 aged 15 years.