Injured Serena withdraws from Miami Open
Serena Williams has withdrawn from the Miami Open after an injury to her left knee, tournament organisers have confirmed.
Williams came through her opening match against Rebecca Peterson in three sets, but will not take to the court to face Wang Qiang on Monday (AEDT).
It is the second successive tournament Williams has been forced to withdraw from.
At the Indian Wells Open earlier this month, she retired during her match with Garbine Muguruza with a viral illness.
