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It is the most in the Open Era, which began in 1968. The figure is taken from Encyclopaedia Britannica, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

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Mondo Knows Facts

Serena Williams won 23 Grand Slam singles titles

It is the most in the Open Era, which began in 1968

Serena Williams won 23 Grand Slam singles titles, the most by any player in the Open Era. Only Margaret Court, with 24, has won more across all eras. Williams won her last major at the 2017 Australian Open, while pregnant.

Serena Williams and Venus Williams — Julie Edgley · CC BY-SA 2.0 · licence · source

Where this comes from

Encyclopaedia Britannica

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Sports trivia

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Tags: tennis, grand-slam, record

Serena Williams won 23 Grand Slam singles titles: the short answers

Where does this come from, and can I check it?: It is the most in the Open Era, which began in 1968. The figure is taken from Encyclopaedia Britannica, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a sports fact?: Yes. It sits on the Sports shelf, one of 1,090 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?: The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.