FILE- In this Jan. 30, 2016, file photo, Serena Williams, of the United States, wipes the sweat from her face during her women's singles final against Angelique Kerber, of Germany, at the Australian Open tennis championships in Melbourne, Australia. The Olympic defeat wasn't even the most disappointing of the year for Williams, who was knocked off in the final of the Australian Open by Germany's Kerber. (AP Photo/Rick Rycroft, File)
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