In the doubles final, Iga Swiatek, Poland, and Bethanie Mattek-Sands, USA, were defeated, with the set numbers 6-4, 6-2.
It is the first time in 21 years that a woman wins both the singles tournament and the doubles tournament in Paris.
"I am just happy.
It is a dream come true ", says Krejcikova to Roland Garro's website.
But Krejcikova and Siniakova are used to winning the French championships.
Today's title was their third in Paris, they together won the girls 'doubles tournament in 2013 and the ladies' doubles tournament in 2018.
ARCHIVE: Peel: Unseeded Czech won French Open (June 12)
Javascript is disabled
Javascript must be turned on to play video
Read more about browser support
The browser is not supported
SVT does not support playback in your browser.
We therefore recommend that you switch to another browser.
Read more about browser support
Barbora Krejcikova barked.
Photo: Bildbyrån