NEW YORK, ⁠Sept 4 (Reuters) - Emma Navarro stunned Czech seventh seedKarolina ⁠Muchova 6-3 7-5 on Friday, notching up her third ‌win over a top-10 opponent this yearas she joined the American march into the weekend at the U.S. Open.

The 26th seed did some of ​her best work from the baseline ⁠as she absorbed the ⁠blows from Muchova, who had been sidelined after reaching the Wimbledon ⁠final ‌in July due to minor surgery.

Navarro next plays either Elina Svitolina or Anna Kalinskaya in the ⁠round of 16.

"I knew it was going to ​be tough today," ‌said Navarro who joined compatriots Taylor Townsend and JessicaPegula ⁠in the ​fourth round, with Madison Keys and Coco Gauff yet to play their third-round matches.

After trading breaks,Muchova dropped her serve with a ⁠misfiring forehand in the penultimate game ​of the opening set, where she produced 22 unforced errors and struggled to find her rhythm.

Navarro, who reached the semi-finals two ⁠years ago in a career breakthrough, beat down her opponent's defences in a more competitive second set, trading breaks twice before converting on her third break-point chance in the 11th ​game.

Navarro, a darling of the outer ⁠courts who said she has played her last six matches ​in New York on the Grandstand, ‌thrust her fists in triumph after ​sealing the win with a lethal forehand.

(Reporting by Amy Tennery in New York; editing by Clare Fallon)