Wimbledon is Williams' best chance'
Williams has been aiming to equal Margaret Court's major record since her return from maternity leave in 2018.
Her 23 Grand Slam titles is the most by any player in the Open Era, with 13 of Court's titles coming before the tour became fully professional.
Since her return, Williams has reached four Grand Slam finals but lost them all, including to Osaka at the 2018 US Open.
Former British number one Annabel Croft says Wimbledon, where Williams has won eight titles, is her best chance to equal Court's record.
"Serena seemed to be in a happy place and I was thinking this is it - this is the time she is going to win her 24th," Croft told BBC Radio 5 Live.