Image source, Getty Images
Pegula won six of nine break points and hit 12 winners
Alex Brotherton
BBC Sport journalist
US Open 2025
Venue: Flushing Meadows, New York Dates: 24 August-7 September
Coverage: Live radio commentaries across 5 Live Sport and BBC Sounds, plus live text commentaries on the BBC Sport website & app
American Jessica Pegula took advantage of compatriot Ann Li's early nerves as she sailed into the US Open quarter-finals with a comfortable victory.
Fourth seed Pegula needed just 54 minutes to beat Li 6-1 6-2 and keep alive her hopes of winning a career-first Grand Slam.
By her own admission, the 31-year-old has not played her best tennis this summer since suffering a humbling first-round exit at Wimbledon.
However, Pegula - who enjoyed a superb run to the final at Flushing Meadows 12 months ago - looked much closer to her best on Sunday as she broke Li six times on her way to victory.
"I know when she's serving well and has confidence she's really dangerous," Pegula said of Li, who she beat in a much tighter match at the French Open back in May.
"I felt like she came out a little slow and nervous and I wanted to jump on that and not let her feel comfortable for a second, that was my motivation all match."
Li represented a potentially tricky opponent despite her world ranking of 58, ranking second for aces with 22 from her first three matches.
The 25-year-old appeared confident as she chose to serve first after winning the coin toss, only for Pegula to break immediately.
Li improved after making 10 unforced errors and winning just 8% of her second serves during the first set, but Pegula seemed to raise her own game in response.
As always Pegula was strong on the baseline but made a conscious effort to move to the net as well. By contrast, Li tended to stay deep in a fruitless effort to keep up with Pegula's powerful strokes.
"I felt really comfortable moving in today and coming in at the right times, it doesn't always feel that good, but it started well and I wanted to keep executing that until the last game," said Pegula.
"It's a part of my game I can really use as a weapon. Sometimes I get stuck at the back because I'm so good there, but we've worked on that a lot and my coaches are happy when I'm finishing overheads and volleys at the net."
In the quarter-finals Pegula will face either world number 62 Barbora Krejcikova or compatriot Taylor Townsend, the latter having eliminated former French Open champion Jelena Ostapenko and world number five Mirra Andreeva without dropping a set.