keywords: zvonareva wta elena vera likhovtseva
text: Zvonareva upset at Filderstadt behind 13 double faults Vera Zvonareva #39;s bid to join four of her Russian compatriots in the top 10 of the WTA Tour rankings was slowed Tuesday at the Porsche Grand Prix when she double faulted 13 times in a loss to Elena Likhovtseva.