
Injury woe for Williams —
Venus Williams was forced to withdraw from the tournament after complaining of a lower back injury. The three-time Miami winner, who was set to face fellow American Sloane Stephens in the third round, hopes to return to action next month.

Wozniacki wobbles —
World No.9 Caroline Wozniacki suffered a shock defeat by Spain's Garbine Muguruza -- a woman ranked 64 places below the Dane. Muguruza needed just 81 minutes to claim a 6-2 6-4 win and leave her opponent stunned.

Pole position —
Agnieszka Radwanska edged through to the fourth round after seeing off Magadalena Rybarikova in three sets. Radwanska, the defending champion, won the first set 7-5 before losing the second 6-2. But the Pole, ranked fourth in the world, hit back to take the decider 6-3. She will face Sloane Stephens in the next round.

Li back in business —
Li Na continued her comeback from injury with a 6-2 6-4 win over American Varvara Lepchenko. The Chinese star, who missed seven weeks of action after sustaining an ankle problem during her Australian Open final defeat, will face Spain's Garbine Murgurza in the next round.

All over for Azarenka —
Australian Open champion Victoria Azarenka was forced to withdraw from the tournament with an ankle injury. "It was really obvious what the decision was couple days ago already," Azarenka told reporters. I just wanted to give my 100 percent possibility to play and today was my last test."

Sharapova hopes for Sunday best —
Maria Sharapova will be hoping to progress to the fourth round Sunday when she takes on fellow Russian Russian Elena Vesnina. Sharapova, who won at Indian Wells last weekend, eased past Canada's Eugenie Bouchard 6-2 6-0 Friday following a power outage.