Serena Williams's victory in the 2017 Australian Open final earned her a 23rd Grand Slam title. (It was her seventh Australian Open title; she has also won the French Open three times, Wimbledon seven times, and the US Open six times.)
Steffi Graf won 22 Grand Slam singles titles (Australian Open four times, French Open six times, Wimbledon seven times, US Open five times).
But ... Margaret Court (née Smith) won 24 titles (Australian Open eleven times, French Open five times, Wimbledon three times, US Open five times).
Steffi Graf's record, which was beaten by Serena Williams, was for the most grand slam singles titles in the Open era. The all–time record is still held by Margaret Court.
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