By Leighton Ginn
Just a day after the draw was announced, world No. 1 Serena Williams has withdrawn from the BNP Paribas Open, citing a left knee injury.
In addition to Indian Wells, Williams has also withdrawn from the Miami Open.
The tournament sent out two Tweets with quotes from Williams.
With Williams’ withdrawal, Angelique Kerber will regain the No. 1 ranking on March 20. Williams needed to reach the semifinals of the BNP Paribas Open to retain the No. 1 ranking.
The tournament was already missing Maria Sharapova, who will finish out her drug suspension at the end of April, defending champion Victoria Azarenka, who is on maternity leave, and Petra Kvitova, who suffered injuries after a home invasion in December.