Swiatek's blend of power, poise and precision on the clay was too much to handle for Gauff, who never recovered from a shaky start in her maiden Grand Slam final.
Poland's Iga Swiatek continued her march towards a second French Open title in three years when she demolished Russian Daria Kasatkina 6-2 6-1 to reach the final.
Despite not being at her best, Iga Swiatek still hit 30 winners in an ultimately one-sided match to make her third Grand Slam semi-final and second in succession.
Tennis star Rafael Nadal will face third-seeded Alexander Zverev in the semifinals after beating the world's number one Novak Djokovic in four sets, a contest that lasted over four hours.
Martina Trevisan, who reached the French Open quarterfinals two years ago as a qualifier, beat Leylah Fernandez 6-2, 6-7 (3), 6-3 to advance to the semis.
The 35-year-old Djokovic cruised through the opening two sets, breaking Molcan's serve three times without giving the Slovakian a single opportunity on his own delivery.
The 2021 US Open champion, who came into Paris with just one match on clay this year following hernia surgery, routed Argentina's 103rd-ranked Facundo Bagnis 6-2, 6-2, 6-2.
Novak Djokovic sees off Monte Carlo Masters champion Stefanos Tsitsipas to claim the last major tournament before French Open, while Iga Swiatek beats Ons Jabeur to retain the women's title.
Naomi Osaka has struggled for form after withdrawing from French Open in May after a row with tournament officials over required media appearances.
Rafa Nadal, 20-time Grand Slam champion, says two-week gap between French Open and Wimbledon not enough time for him to recuperate after demanding clay-court season.
Twenty five-year-old Czech player beats Russia's Anastasia Pavlyuchenkova 6-1, 2-6, 6-4 to claim her maiden Grand Slam title.
Novak Djokovic handed 13-time champion Rafael Nadal only his third defeat in 16 years and 108 matches at the French Open to reach his sixth Roland Garros final after an epic showdown which even beat the country's Covid-19 curfew.
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