Serena Williams has withdrawn from the Miami Open due to a left knee injury, the tournament announced Saturday.
The former world No. 1 was supposed to play No. 18 seed Qiang Wang on Sunday in the third round.
"I am disappointed to withdraw from the Miami Open due to a left knee injury," Williams said in a statement, according to the WTA. "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.
"I hope to be back next year to play at this one-of-a-kind tournament in front of the incredible fans here in Miami."
Williams defeated Sweden's Rebecca Peterson 6-3, 1-6, 6-1 in her opening match of the tournament.
The 37-year-old was playing in just her third tournament this season. Williams lost in the quarterfinals of the Australian Open and retired from her third round match at Indian Wells due to a viral illness.
The 23-time Grand Slam champion has won the Miami Open a record eight times.