Serena Williams has withdrawn from the Miami Open due to a left knee injury.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

Kyrgios provisionally suspended after testing positive for cocaine, ITIA says
Suthar's spin masterclass helps India beat Sri Lanka
Bayern's Musiala diagnosed with neurological disorder after two on-field collapses
Sri Lanka top order falters, India sense victory
Williams sisters beaten on doubles return at Cincinnati Open
