Serena Williams has withdrawn from the Miami Open due to a left knee injury, the tournament announced on Saturday.
"I am disappointed to withdraw from the Miami Open due to a left knee injury,” Williams said in a statement. “It was an amazing experience to play at the Hard Rock Stadium this year and would like to thank the Miami Open for putting on an amazing event."
Williams, 37, was coming off of a tough three-set victory over Rebecca Peterson on Friday, winning 6-3, 1-6, 6-1 to reach the third round. Williams would have faced Qiang Wang in the fourth round on Sunday.