Top-seeded Victoria Azarenka reached the U.S. Open quarterfinals for the first time and set up a match against defending champion Sam Stosur.
Azarenka played a bit raggedly but did not have too much trouble putting together a 6-2, 6-2 victory over 73rd-ranked Anna Tatishvili on Sunday night.
Azarenka, who won the Australian Open in January, had more unforced errors, 24, than winners, 22, and lost serve three times. But she broke Tatishvili seven times and has lost a total of only 10 games through four matches.
Next for Azarenka is the seventh-seeded Stosur, who eliminated British teenager Laura Robson 6-4, 6-4.