Serena Williams booked a quarter-final meeting with Karolina Pliskova in New York, while Sloane Stephens and Anastasija Sevastova also won.
A spot of sushi helped Sloane Stephens reach round three of the US Open, while Venus Williams is in line to face a very familiar foe.
Simona Halep became the first top-seeded woman to lose in the opening round of the US Open.
A recent purple patch for Kiki Bertens continued on Friday, as she defeated fifth seed Elina Svitolina at the Cincinnati Masters.
Two-time winner Serena Williams exited the Cincinnati Masters on Tuesday, as Caroline Garcia and Karolina Pliskova advanced.
The determination of Elina Svitolina was not enough to halt Sloane Stephens' march into the final of the Rogers Cup.
Ukraine's Elina Svitolina rallied to beat 14th seed Elise Mertens in straight sets in Montreal on Friday.
Mihaela Buzarnescu won her first WTA title last week but suffered an ankle injury in the Rogers Cup that will rule her out of the US Open.
German fourth seed Angelique Kerber was surprisingly bundled out of the tournament by Alize Cornet in straight sets on Wednesday.
Nao Hibino was given a walkover into the last eight of in Kuala Lumpur after Elina Svitolina pulled out on weather-affected day three.