Australia and the United States have added fuel to their simmering rivalry as the top swimming nations at the Tokyo Olympics - but it is the emergence of two teenage sensations that could spark the flames at Paris 2024.
Mollie O'Callaghan is already well down the path to being Australia's next swimming superstar while the USA can look to 17-year-old Bella Sims as their comparable young gun.
The 18-year-old O'Callaghan claimed gold in the 100m freestyle at both the Commonwealth Games and world championships, as well as silver medals in the 200m freestyle at the same two meets.