The No 1 ranking is also at stake in today's matches. She reached the final four of the Australian Open. On the face of things, Keys seems to have the easier path to the semifinals. It hadn't happened at any Grand Slam tournament since Wimbledon four years after that.
Rublev next faces top-seeded Rafael Nadal, who beat Alexandr Dolgopolov 6-2, 6-4, 6-1 earlier Monday.
"I don't care. I don't think something is going to change if you are number two".
Even though it was a singles match, there were two winners and one loser on Wednesday afternoon.
Keys, seeded 15th, won 7-6 (7-2) 1-6 6-4, ending Svitolina's hopes of becoming world number one.
Pliskova's loss means Garbiñe Muguruza of Venezuela is assured of moving up to No. 1 in the WTA rankings for the first time.
It is a remarkable achievement for the American women, especially considering Serena Williams isn't among the group, now away from the sport having given birth. "We have so many Americans to talk about in the last days of the U.S. Open", Keys told The Associated Press.
Madison Keys completed the clean sweep for American women, giving the host country all four U.S. Open semifinal spots for the first time in 36 years. "Maybe I gave her the opportunity to play well", Brady said.
It is the best performance by American women since Venus and Serena Williams, Lindsay Davenport, Jennifer Capriati and Monica Seles all reached the last eight in 2002.
But it's further into the history books since such a landmark was made - Evert and Navratilova were joined by Barbara Potter and eventual champion Tracy Austin in the all-American affair.
Tiebreakers have been the key to success for this generation of Americans as well. "Obviously she has a big serve". Vandeweghe grew up in a family with many accomplished athletes: her grandfather Ernie and uncle Kiki played in the National Basketball Association, and her mother was an Olympic swimmer.
After wrapping up victory, Vandeweghe briefly fell to her knees before walking over to her box to shake hands and exchange words with her coach, former Wimbledon champion Pat Cash. This match will come down to physical execution, of course, but the mental approach each woman brings to bear will dictate the result to an equal if not greater degree. Her other was at the Australian Open in 2015. The narrative fits. Vandeweghe comes from a family of athletes: Her grandfather, great-uncle and uncle were National Basketball Association players, and her mother was an Olympian in two sports. But with this game, I think you never gonna feel the best with the game what she's playing.