Top seed Elina Svitolina had no trouble booking her spot in the Chicago Women's Open quarter-finals on the same day Venus Williams and Sofia Kenin pulled out of the US Open. Svitolina made light work of Fiona Ferro on Wednesday, cruising to a 6-4 6-4 victory at the WTA 250 tournament.
The Ukrainian star and bronze medallist at the 2020 Olympic Games in Tokyo will face seventh seed Kristina Mladenovic in the quarters.
Marketa Vondrousova – the fifth seed, ninth seed Alize Cornet, Tereza Martincova and Rebecca Peterson also moved through from the round of 16.
At Tennis in the Land, second seed Anett Kontaveit secured a quarter-final berth by topping Caroline Garcia 6-3 6-3 in Cleveland.
Meanwhile, Williams and Kenin withdrew from next week's US Open at Flushing Meadows.
Williams – a two-time US Open champion – will not compete in New York due to a persistent leg injury, joining sister Serena in sitting out the year's final grand slam.
"It's super, super, super disappointing," Williams said in a video via her Twitter and Instagram accounts. "I'm having some issues with my leg all this summer, and just couldn't work through it.
"I tried my best here in Chicago [at the WTA 250 Chicago Women's Open], but I just was unable to figure out the equation. And there's been so many times where I've been able to figure it out, even not in the best of my health, but this time, I just couldn't make any miracles work."
Kenin – the 2020 Australian Open champion – withdrew after testing positive for coronavirus.
"Fortunately I am vaccinated and thus my symptoms have been fairly mild," Kenin tweeted. "However I have continued to test positive and thus will not be able to compete at the US Open next week."
"I plan to spend the next several weeks getting healthy and preparing to play well this fall. Thank you all for supporting me. I want to wish all the players the best of luck in New York."