PALERMO, Italy (AP) -- Polona Hercog of Slovenia extended her winning streak on the WTA circuit to eight matches by routing Klara Zakopalova of the Czech Republic 6-1, 6-1 in the quarterfinals of the SNAI Open on Friday.
The 20-year-old Hercog, who won her first career title last week, converted six of her seven break points. She will play either top-seeded Flavia Pennetta or Tsvetana Pironkova in the semifinals.
Petra Cetkovska of the Czech Republic rallied to edge the third-seeded 2008 champion Sara Errani 5-7, 6-3, 7-6 (4) and reach her first career semifinal.
The 52nd-ranked Cetkovska will face the winner of the quarterfinal between Anabel Medina Garrigues and Irina-Camelia Begu, who took the title in Budapest last week.