Swiatek brushes aside Gauff to win second French Open title
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The 21-year-old Pole stormed to a 6-1, 6-3 win in only 68 minutes on Court Philippe Chatrier, equalling Venus Williams' record for the longest winning run by a woman in the 21st century.
Swiatek celebrated her sixth straight title this year in the players' box with her friends and family.
A disconsolate Gauff was left sitting on her seat in tears after a nervous performance, punctuated by 23 unforced errors and three double faults.
The 18-year-old American came up short in her bid to become the youngest Grand Slam singles champion since Maria Sharapova won Wimbledon in 2004.
Swiatek, only the 10th woman to win multiple French Opens in the Open era, lost just one set in the tournament -- against China's Zheng Qinwen in the fourth round.
She has now won all three of her career meetings with Gauff, who was playing in her first major final.
Gauff will now turn her attentions to Sunday's doubles final, where she will face home favourites Caroline Garcia and Kristina Mladenovic alongside compatriot Jessica Pegula.
Swiatek improved her remarkable record in finals, having won her last nine on the WTA Tour.
The 18th seed found herself 3-0 and a double break down just 16 minutes into the match, as Swiatek's powerful backhand helped her win a lengthy third game on her fifth break point.
Gauff finally got on the board with a scrappy hold to the delight of the crowd, but she had dropped a set for the first time in the tournament just minutes later.
The Pole gifted her opponent a potential route back into the match, making four unforced errors to throw away her serve in the first game of the second set.
She made it five straight games to move within one of the title, losing only five points in the process.
But the top seed did just that on her first match point, dropping to the red clay in celebration as Gauff sent a return flying long.