Serena Williams has withdrawn from the BNP Paribas Open in Indian Wells and the Miami Open due to a left knee injury.
The withdrawal means she will relinquish the world number one tennis ranking to German Angelique Kerber.
Newsverge reports that Williams, a two-times champion at the showpiece event at the California desert resort, had returned to the women’s top ranking in January.
This was after she claimed a record 23rd grand slam singles title in the professional era at the Australian Open.
Newsverge reports that the women’s main draw at the BNP Paribas Open begins on Wednesday, while the Miami Open, which Williams has won eight times, runs from March 20 to April 2.
“Sadly, I have to withdraw from the BNP Paribas Open in Indian Wells and the Miami Open,” Williams said on the BNP Paribas Open’s website on Tuesday.
“I have not been able to train due to my knees and I am disappointed I cannot be there. I will keep moving forward and continue to be positive. I look forward to being back as soon as I can.”
The 35-year-old Williams had needed to reach the Indian Wells semi-finals for a chance to retain her number one ranking.
But her withdrawal means Kerber will unseat her after the tournament, according to the WTA website.
In 2015, Williams returned to the BNP Paribas Open for the first time since an ugly episode in 2001 when she triumphed in a final that was marred by racist abuse.
Some spectators had booed and heckled the American and her family.
The heckling was in apparent response to Serena’s sister Venus having withdrawn from their semi-final that year just minutes before the match.
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