US swimming star Katie Ledecky has been virtually unbeatable in the 400 metres. No one told Ariarne Titmus — watch her power home over the final 50m Story here: https://ab.co/2M5dbzo | ABC Perth

20K views · 238 reactions | At 24, Olympian Ariarne Titmus has...

WATCH: This is the heartwarming moment Olympic swimming legend Ariarne Titmus is surprised by her best friend LIVE on Today just moments after touching down in Australia. #9Today | TODAY

Four-time Olympic champion Ariarne Titmus has announced her retirement from swimming after 18 years in the sport. The 25-year-old says it's the 'right time' to enter a brand new chapter. #AriarneTitmus #Retirement #Swimming #Announcement #Olympics | 7NEWS Townsville

Australian swimming legend Ariarne Titmus has announced she is retiring from swimming. 🏊 The 25-year-old posted a letter to herself on Instagram saying "18 years you spent in the pool competing. 10 of those representing your country. You went to two Olympic Games and ever better, you won!!! ... What’s ahead for you is exciting. New goals, more time with the people you love most and the chance to wholeheartedly put yourself, not your sport first. Make sure you enjoy every moment, big or small. T

11K views · 69 reactions | Two days after claiming a maiden gold medal in the 400m freestyle final, Ariarne Titmus had a blistering final lap to touch the wall in 1:53.50 in Olympic record time and claim the 200m freestyle crown. Here's how the race was won. Follow our live coverage: bit.ly/3zHHUIh | The Sydney Morning Herald | Facebook