Emma Raducanu overcame a two-hour rain delay to reach the quarter-finals of the Washington Open with victory over American Peyton Stearns.
Raducanu, who turned down the chance to play for Great Britain at the Olympics, defeated Stearns, ranked 51 in the world, 7-6 (8-6) 6-2.
Heavy rain started falling as Raducanu served to secure the opening set. After a delay, she clinched the set in a tie-break.
"It's tricky today, when you get rained off at such a big moment like that. It can affect the dynamics of the match," said Raducanu.
She will face the winner of the match between wildcard Paula Badosa and third seed Liudmila Samsonova.