Injury blow for Sam Stosur
Third seed Samantha Stosur bowed out of the Family Circle Cup in Charleston after retiring due to a injury from her third-round clash with Canadian teenager Eugenie Bouchard.
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One day after beating British 16th seed Laura Robson in three sets, Bouchard was on easy street against Stosur as she built a 6-1 2-0 lead, at which point her opponent pulled out.
Australian Stosur, 29, had to abandon last month's Indian Wells event due to a calf injury that prevented her contesting a quarter-final against Angelique Kerber, and it was a similar problem that curtailed her match against 19-year-old Bouchard.
Rain wiped out a large part of the schedule on day four, including the third-round matches involving Serena Williams and Venus Williams which were put back to Friday.
There was no play at all before the evening as rain fell and tournament officials made certain the claycourts were ready for play.
Prior to Stosur's late-night exit, Serbian ninth seed Jelena Jankovic ousted American Jessica Pegula 6-0 6-4, and Switzerland's Stefanie Voegele caused a surprise by beating German 10th seed Julia Georges 3-6 6-1 6-3.
Caroline Wozniacki was handed a place in the quarter-finals when injury forced Andrea Petkovic to pull out of their match before a ball was hit.
Second seed Wozniacki had been expecting a stiff test from German player Petkovic, who had looked sharp in her opening two matches, but not for the first time in recent times a physical setback struck the former world number nine.
Petkovic revealed she had a minor calf problem, and told tournament officials she would not be able to take to the court.
Explaining her injury, Petkovic wrote on Twitter: "I had to pull out from my match with Caroline because of my right calf. It's been troubling me for the past days & it got worse this morning. With the experience I've had with injuries in the past year, I've come to the conclusion it's better to be precautious now.
"Thank you for your understanding and I truly hope it's just a matter of days before I get better."
Petkovic has been cruelly affected by injury over the past 12 months, dropping to her misleading current ranking of 139th.
The upshot of her withdrawal is that Wozniacki, the tournament's 2011 champion, has reached the last eight by playing just one match. She was given a first-round bye and then dropped just two games in the second round against Spain's Silvia Soler-Espinosa.