O'Callaghan, who beat McKeon's time of 52.67 seconds to win the gold at the world championships in Budapest last year
The FINA Youth Water Polo World Championships is an international competition for water polo players under the age of 18.
As Australian swimming legend Ian Thorpe turns 39, we look back at his decorated career - and status as an LGBTQ icon.
Australia, the second most successful swimming nation, will look to extend its dominance in the sport while also winning medals in other disciplines.
Former breaststroke world record holder Matt Wilson was also named part of the relay team as he just failed to achieve his qualifying time.
She called out "misogynistic perverts in sport" and slammed them for body shaming and medically gaslighting young women and girls in sports.