Serena Williams has withdrawn from the Miami Open due to a left knee injury.
The eight-time champion was forced to hand a walkover to China’s Wang Qiang in the third round of the tournament.
It's the second consecutive WTA event the 37-year-old Serena has had to withdraw from.
She recently retired from the tournament in Indian Wells due to a viral illness.
Serena is yet to win a title since returning from maternity leave last year.

Yamal strike earns Barcelona win at Athletic Bilbao
Marmoush double helps Man City win at Newcastle, place in FA Cup quarters
Chelsea reach FA Cup quarter-finals with win over Wrexham
Arsenal survive Mansfield scare to reach FA Cup quarter-finals
Verstappen crashes out in first qualifying session in Australia
