Australian Ariarne Titmus set a new world record in the 400m freestyle with a time of 3 min 55 sec 38/100, winning the final of the world championships on Sunday in Fukuoka, Japan.
The 22-year-old reigning Olympic champion improved on the record held by young Canadian Summer McInthosh since last March, and won her second world title in this discipline, beating American Katie Ledecky.