Britain's Emma Raducanu recovered from 5-2 down in the second set to beat Maria Sakkari in straight sets at the Washington Open and reach her first semi-final of 2025.
The 22-year-old, who upset seventh seed Marta Kostyuk in the first round and overcame four-time Grand Slam champion Naomi Osaka on Thursday, beat her Greek opponent 6-4 7-5.
Raducanu will face either Anna Kalinskaya or fourth seed Clara Tauson in the last four as she bids to reach her first WTA final since winning the US Open in 2021.
She told Sky Sports: "I've been doing a lot of good work. Little by little as you get results, you build confidence.
"But the amount of work I'm doing behind the scenes, to have that banked, you know you've done it. It takes a little bit of pressure off the results."
Raducanu also remains in the hunt for silverware in the women's doubles after reaching the semi-finals with partner Elena Rybanika. They face second seeds Taylor Townsend and Zhang Shuai later on Friday.
