Petra Kvitova withdrew from WTA Championships
Petra Kvitova pulled out from the WTA Championships in Istanbul due to a viral illness and will be replaced by Samantha Stosur.
Kvitova, who was the defending champion, played her first match in the White group on Tuesday but lost 6-3 6-2 to Agnieszka Radwanska.
Stosur will play against Maria Sharapova and Sara Errani.
Kvitova is scheduled to represent her country in the Fed Cup final against Serbia in Prague next week.
Photo by REUTERS/Yuriko Nakao