Louise Hansson first won the 100 meter butterfly in the time of 55.67, about four tenths of a personal best.
In the end, she was chased by the Australian star Emma McKeon, but the Swede eventually won by 11 percent.
Shortly afterwards, Sarah Sjöström won 50 meters free for her Energy Standard.
She won in the time of 23.53, which was over two tenths better than the second Kasia Wasick.
In that race, Michelle Coleman became sexa.
In addition, Sjöström's team also won the team race 4x100 meters freestyle.
The others in the team were Siobhan Haughey, Femke Heemskerk and the Finnish Fanny Teijonsalo.
ISL is a simile that consists of a basic series and a final.
The team has nothing to do with nations, but Coleman and Hansson represent the Toronto Titans while Sjöström swims for Energy Standard.
MORE SWIMMING: Hansson's form holds - won again in ISL (16/9)
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Louise Hansson's top form holds up.
Photo: Eurosport / Bildbyrån