France's Leon Marchand also completed a golden double with a victory in the men's 200m butterfly title, following his 400m individual medley victory on Monday.
In the women's 200m freestyle final, Mollie O'Callaghan broke the world record as she led Australia to a 1-2 finish.
The 19-year-old hit the wall first in a time of one minute 52.85 seconds, taking 0.13 seconds off the previous world record of 1:52.98, set by Italy's Federica Pellegrini.
Ariarne Titmus, the 400m freestyle winner, came in second with 0.16 seconds behind. Canada's Summer McIntosh, 16, finished third.
The men's 800m freestyle title went to Tunisia's Ahmed Hafnaoui, the Tokyo Olympic 400m gold winner.
