Serena Williams has withdrawn from the Miami Open due to a left knee injury.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.

Baptiste's variety drags Sabalenka out of comfort zone in Madrid shock
FIFA to increase financial distribution to all 48 World Cup teams by 15%
Sabalenka stunned by Baptiste in Madrid Open quarter-finals
Palestinian football body appeals to sports court over FIFA Israel ruling
Holders PSG edge Bayern 5-4 in record-breaking semi-final first leg
