Serena Williams takes down Sloane Stephens to advance to fourth round of U.S. OpenWilliams will face Maria Sakkari of Greece in fourth round9/5/2020, 9:09 PMSep 5, 2020; Flushing Meadows, New York, USA; Serena Williams of the United States celebrates after match point against Sloane Stephens of the United States (not pictured) on day six of the 2020 U.S. Open tennis tournament at USTA Billie Jean King National Tennis Center. Mandatory Credit: Danielle Parhizkaran-USA TODAY Sports / Danielle Parhizkaran-USA TODAY Sports