Elina Svitolina of Ukraine, left, and Madison Keys of the United States shake hands after their fourth-round match on day seven of the 2019 US Open. Photo: Danielle Parhizkaran-USA TODAY Sports

NEW YORK - Ukrainian fifth seed Elina Svitolina delivered a solid serving performance to beat American Madison Keys 7-5 6-4 on Sunday and secure a spot in the U.S. Open quarter-finals.

With Keys, who finished runner-up in 2017, struggling with her backhand, Svitolina won 92 perecent of her first serve points and did not face a single break point during the 75-minute clash under the Arthur Ashe Stadium lights.

"Very pleased that I could play very consistent tonight and in such a great atmosphere is very special," said Svitolina, who capped the match in style when she served out to love.

With the win, Svitolina is the first Ukrainian woman to reach the U.S. Open quarter-finals since Kateryna Bondarenko in 2009.

Up next for Svitolina will be Briton Johanna Konta, who upset Czech third seed Karolina Pliskova earlier on Sunday.