FILE - In this Jan. 30, 2016, file photo, Angelique Kerber, of Germany, celebrates after defeating Serena Williams, of the United States, in the women's singles final 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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