Petra Koch crashes out of Pan Pacific Open in Tokyo . 2011 Wimbledon champion goes out in second round to Petra Koch . Maria Sanchez and Caroline Wozniacki advance to third round . Former Wimbledon champion Petra Kvitova became the first big name seed to exit the star-studded WTA tournament in Tokyo as she fell victim Tuesday to unheralded Croatian Petra Martic . Defending champion Agnieszka Radwanska also through .
Petra Koch crashes out of Pan Pacific Open in Tokyo . 2011 Wimbledon champion goes out in second round to Petra Koch . Maria Sanchez and Caroline Wozniacki advance to third round . Defending champion Agnieszka Radwanska also through .