The Polish top seed saw off Sabalenka 6-2, 6-1 in their women's singles semifinal in the Italian capital on Saturday, tallying her 27th consecutive victory.
Świątek will now face either Tunisia's Ons Jabeur or Russia's Daria Kasatkina in the championship match.
The 20-year-old Pole last month won the Stuttgart Open tournament in Germany, claiming her seventh career singles title.
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Source: IAR, PAP