New Zealand No 1 Marina Erakovic stunned top-seeded and defending champion Victoria Azarenka of Belarus, 4-6, 7-5, 6-2 at the Stanford Classic in California to reach her second quarterfinal of the year. The 23-year-old world No 121 took a tick over two hours to upset the Belarussian 4-6 7-5 6-2, to book a quarterfinal against eighth seed and world No 19 Dominika Cibulkova, of Slovakia. Erakovic’s father, Mladen, said he always felt she was capable of a big result, with the US Open looming. “I always believed in Marina. It was just a matter of staying healthy and working hard and the results will come,” he said. Erakovic went on to lose in the quarterfinal to world No 19 Slovakian Dominika Cibulkova, 6-1, 6-1.