Unseeded Morgina slugged out hard to beat giant-slayer Georgina Garcia-Perez of Spain, who had beaten top-seeded Jia-Jing Lu of China in the second round, to set up semifinal clash with the fellow Russian Kamenskaya.
Georgina fired seven aces and committed three double faults against Morgina, who was more fault-ridden as she served five double faults, but still the Spaniard ended up on the losing side. Morgina won the first set 6-4, while her opponent took the second by the same margin.
Kamenskaya, too, was taken to the distance by her sixth- seeded opponent, Barbara Haas of Austria, before she closed out the contest 6-4 0-6 6-4.
In the bottom half of the draw, no. 2 seed Polina Leykina of Russia lost to Belarussian Aryna Sabalenka in straight sets, 4-6 2-6.
Sabalenka will meet seventh seed Nina Stojanovic of Serbia who ended the run of qualifier Ana Veselinovic of Montenegro. Stojanovic won 6-3 7-5.
Thombare and Hsu defeated fourth-seeded duo of Jia-Jing Lu and Ankita Raina of India 4-6 7-5 10-8, while Ivakhnenko and Vasylyeva got past third seeds Anna Morgina and Nina Stojanovic 5-7 6-3 10-6.
