She won in a time of 58.82, seven hundredths ahead of Kayla Sanchez, Singapore.
Hansson and Sanchez both swim for the Toronto Titans.
Sarah Sjöström, who won 50 meters freestyle yesterday, had to settle for second place in the double distance.
The third in the 50 meter freestyle, Siobhan Haughey, Hong Kong, won in the 100-meter distance, 33 hundredths ahead of Sjöström.
Both compete for Energy Standard in the team competition.
CLIP: Sjöström: "I hope it gets much better" (July 11, 2021)
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Sjöström: "I hope it gets much better"