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With all but four matches postponed because of the rain, Venus and Serena Williams had the day off on Thursday.

The Williams sisters will most likely be forced to play two matches today. That’s as long as they advance out of the third round to the quarterfinals.

Venus Williams is scheduled to play Varvara Lepchenko at 11 a.m., on Billie Jean King Court, while younger sister and top seed Serena Williams will face Mallory Burdette no earlier than 1 p.m.

What had been a light to moderate rain Thursday morning escalated into a downpour by mid-afternoon, resulting in the postponement of all scheduled day matches for the Family Circle Cup.

Tournament officials are optimistic they will be able to get the event back on track with only a 30 percent chance of rain today. Tickets for Thursday’s day session will be honored at today’s day session.

The last time a Family Circle Cup session was canceled because of weather was the Thursday night session last year.

Wozniacki gets walkover victory

Caroline Wozniacki, the 2011 Family Circle Cup champion, had an easy ride to the quarterfinals of this year’s event. Wozniacki’s scheduled opponent in the round of 16, Andrea Petkovic, withdrew before the match that was scheduled to begin at 11 a.m., giving Wozniacki a walkover win. Petkovic has been nursing an injury to her right calf.

Wozniacki will next face Stefanie Voegele.

“I’m very happy that I came here. It is a very beautiful tournament and I loved every part of it here,” said Petkovic, who is from Germany.

“I hope to come back again under better conditions. I’m really sorry that I had to pull out but it was just too dangerous and I don’t want to risk anything.”

Petkovic said on her Twitter account that the calf injury had been bothering her “for the past days & it got worse...”

Rain forces TV re-run

The rain also played havoc with the opening day of television coverage by ESPN2, which was scheduled to broadcast the Serena Williams-Mallory Burdette match.

Instead, the network showed Serena Williams’ 6-4, 6-4 win Tuesday over Camila Giorgi. ESPN2 is scheduled to cover the event again today at 1 p.m.

Attendance

The attendance total for the Family Circle Cup remained at 44,153 with the washout of Thursday’s day session.

There were fewer than 1,000 fans on hand for Eugenie Bouchard defeat Samantha Stosur on the Billie Jean King Court.