Top seeded Sara Errani of Italy needed three sets to beat home favourite Melinda Czink 6-4, 1-6, 6-1 in the second round of Budapest Grand Prix on Wednesday.

"She started to play better in the second set and I got nervous," said Errani said. "I had two games from 40-15 that I lost. In the third set, I tried to be calmer, to hit the ball deeper and push her outside the court, and that worked better."

Errani, who has won Acapulco and Barcelona title this year, extended her winning streak to 12 matches on clay.

Also, fifth seeded Marina Erakovic got an easy entry into the quarter-finals when her opponent Akgul Amanmuradova retired with a right elbow injury after losing the first set to love.

sixth-seeded Petra Martic scored a 6-4, 6-1 win over Hsieh Su-Wei.

"She's a very tough opponent," said Martic "We played two months ago and it was not a very good memory for me. It was really important to me to try to do better than the last time."

Russian Elena Vesnina posted the upset of the day as she defeated second seeded Ksenia Pervak 6-2, 6-3.

Barbora Zahlavova Strycova stunned another seed and compatriot Czech Klara Zakopalova 6-3, 6-3.