Ninth seed Pliskova, tournament winner in 2019, failed to win a game in a completed match for just the second time in her career.
The 29-year-old, from the Czech Republic, was playing in her third consecutive final in Rome having retired in last year’s final due to a leg injury as she trailed Simona Halep 6-0 2-1.
Swiatek, who had saved two match points against Barbora Krejcikova in the third round, made only five unforced errors against Pliskova and struck 17 winners. Saving match points in the Round of 16 Winning her QF AND SF on the same day Clinching a 1st WTA 1000 title 6-0, 6-0 in the final