Navarro stuns seventh seed Muchova to reach US Open fourth round

NEW YORK, Sept 4 : Emma Navarro stunned Czech seventh seed Karolina Muchova 6-3 7-5 on Friday, notching up her third win over a top-10 opponent this year as 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 Jessica Pegula 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 ope