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Ariarne Titmus and Katie Ledecky reignite their rivalry for the fourth and final time on Saturday as they battle for the women's 800m freestyle.
Titmus has won both individual events against America's greatest ever female swimmer so far, taking gold in the 200m and 400m freestyle.
The USA star produced a stunning anchor leg of the women's 4x200m relay to overtake Australia for silver but dominates the longer races, comfortably winning the 1500m earlier these Olympics.
It will be the final time Titmus swims at the Tokyo Games which have made her a household name in Australia and around the world.
Teammate Kaylee McKeown, who won the hearts of Aussies with a charming interview following her 100m backstroke gold, is back in the pool chasing more medals in the 200m backstroke alongside veteran Emily Seebohm.
Australia will also compete for the 4x100m mixed medley on Day 8 of the Olympic Games.
The world's best male and female tennis player will face off as well as Australia's Ash Barty plays Serbia's Novak Djokovic for the bronze medal in the mixed doubles.
Golden girl: Titmus beams as she holds up the gold medal for the women's 400m freestyle
Titmus' teammate Kaylee McKeown is on track in her quest to also become a double gold medallist at the Tokyo Games
Rohan Browning will run from 9:45pm in the 100m sprint - he holds the third-fastest time by any Australian in history