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ROME, ITALY - MAY 15: Serena Williams (C) of the United States holds her trophy after she won the final match of the WTA Tennis Open tournament against Medison Keys of the United States at the Foro Italico in Rome, Italy on May 15, 2016. (Photo by Claudio Pasquazi/Anadolu Agency/Getty Images)

ROME, ITALY - MAY 15: Serena Williams (C) of the United States holds her trophy after  she won the final match of the WTA Tennis Open tournament against Medison Keys of the United States at the Foro Italico in Rome, Italy on May 15, 2016. (Photo by Claudio Pasquazi/Anadolu Agency/Getty Images)