FILE - In this March 27, 2017, file photo, Angelique Kerber, of Germany, hits a return to Risa Ozaki during the Miami Open tennis tournament in Key Biscayne, Fla. Kerber is back at No. 1, replacing the pregnant Serena Williams atop the WTA rankings. Monday's May 15, 2017, move up from No. 2 represents Kerber's third stay to the top spot, for a total of 26 weeks.(AP Photo/Lynne Sladky, File)
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