New York [USA], Aug 31 (ANI): Australia's Ashleigh Barty and America's Serena Williams progressed to the fourth round of the US Open on Friday (local time) after winning their respective third-round matches.Barty defeated Maria Sakkari 7-5, 6-3 whereas Williams outclassed Karolina Muchova 6-3, 6-2.The 23-year-old Barty had to toil hard in the first set against Sakkari, but she managed to win the first set 7-5.The youngster, however, made light work of her opponent in the second set by displaying aggressive gameplay and she finally ended up taking the set 6-3.Williams, however, had a back and forth battle against Muchkova. Both the tennis stars had a tense first set as the duo went back and forth and at one stage the scoreline read 3-3.The American was however able to show her experience and she ended up taking the set 6-3.The second set proved to be an easy challenge for the number eight seed Serena as she wrapped up the set 6-2. (ANI)

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