Barbora Krejcikova became the first woman for 21 years to win both singles and doubles titles at the same French Open as the Czech completed her staggering fortnight in Paris.

"We will have a little glass of champagne," said Krejcikova, the breakout star of Roland Garros this year, after she and Katerina Siniakova fended off Iga Swiatek and Bethanie Mattek-Sands in Sunday's doubles final.

A 6-4 6-2 victory for the Czech duo gave them a third women's grand slam title as a pair, and a second in Paris after their 2018 triumph.

Krejcikova was already established as a world-class doubles player, but it has been as a singles player that she has emerged in recent times, having only entered the WTA top 100 rankings for the first time last October.

A three-set victory over Anastasia Pavlyuchenkova in Saturday's singles final gave the world number 33 a first major title without a team-mate at her side.

The doubles triumph means the French Open women's title double has been achieved for the first time since Mary Pierce cleaned up in 2000, when the Frenchwoman beat Conchita Martinez in singles and paired up with Martina Hingis to beat Paola Suarez and Virginia Ruano Pascual.

The 25-year-old Krejcikova becomes just the seventh woman to clinch the double, after Billie Jean King, Margaret Court, Chris Evert, Virginia Ruzici, Martina Navratilova and Pierce.

Pierce wrote on Twitter: "Well done @BKrejcikova! Welcome to a very special club."

Krejcikova said she had not slept well after her singles triumph, and she felt not only tired but complained of "having some pains in my leg" after the doubles.

It has been a strenuous fortnight, and she was determined to finally unwind on Sunday evening.

"I think we going to have a dinner together this evening. We will have a little glass of champagne," she said.

"I already said I don't really drink but I think it's a time to actually celebrate it. I think we going to really enjoy ourselves.

"The rest, I just want to go back home. I just really have to relax. I have to spend some time with my family. After that, just start to work again."

Krejcikova will be a marked player at Wimbledon after her rapid rise in the rankings was capped by the slam success.

"I hope I'm going to have some chances on the grass, but I don't really know because I'm not that experienced on it," she said. "We will see.

"I just know from now on I can really enjoy because I have pretty much achieved everything I really wanted.

"Now I can just improve, that's the only thing I can do, just improving. All the guys and the ladies are doing. That's what I think."