The 13th-ranked Swiss player took barely an hour to beat the eighth-ranked Kasatkina.
Sabalenka's last single title came in Madrid in May 2021 but went without a title in 2022 despite reaching three finals.
Iga Swiatek won her 34th match in a row and is now one win away from both her French Open 2022 title and matching Venus Williams for the longest streak on the tour since 2000.
Veronika Kudermetova then followed suit, opting not to play against Belinda Bencic because of a left hip injury.
The 21-time major winner was deported from Australia a year ago after arriving unvaccinated against COVID-19.
Iga Swiatek defeated 11th-seeded Jessica Pegula 6-3, 6-2 at the French Open 2022 quarterfinals. She will next meet Daria Kasatkina.
This was Kasatkina's first win over her Czech challenger. The last time they faced each other was on clay in 2018 with Kvitova winning 6-4 6-0.
Iga Swiatek routed Aryna Sabalenka 6-2, 6-1 to extend her winning streak to 27 matches and reach the Italian Open final.
No. 1 Aryna Sabalenka, No. 3 seed Anett Kontaveit, No. 6 Karolina Pliskova, No. 11 Emma Raducanu, No. 15 Elina Svitolina, No. 18 Leylah Fernandez, etc. - all...
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