Venus Williams returned to the final four at Melbourne Park for the first time since 2003, after beating Anastasia Pavlyuchenkova in straight sets on Tuesday.
Serena Williams won a thrilling, three-set quarterfinal match Wednesday night, thwarting No. 5 seed Simona Halep 6-2, 4-6, 6-3.
Serena Williams cruised into the quarterfinals to continue her quest for her 23rd major singles title, but sister Venus Williams fell to Karolina Pliskova in a third-set tiebreak.
Caroline Wozniacki eliminated eighth-seeded American Madison Keys 6-3, 6-4 Sunday to reach the US Open quarterfinals, her deepest run at a Grand Slam tournament in two years.
Serena Williams and Novak Djokovic will both face tests in the first round of the US Open as the draw was announced Friday.
Johanna Konta captured her first career singles title by outslugging top-seeded Venus Williams to win the Bank of the West Classic in three sets on Sunday.
