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FILE - In this Sunday, Aug. 19, 2018 file photo, Simona Halep, of Romania, returns to Kiki Bertens, of the Netherlands, during the finals at the Western & Southern Open tennis tournament in Mason, Ohio. Halep is back as the year-end No. 1 for the second year in a row despite a back injury that doctors say could lead to a long-term problem. Halep won her first major title at this year's French Open and has had a consistent season but may be forced to pull out of the upcoming Kremlin Cup and the season-ending WTA Finals because of a herniated disk. (AP Photo/John Minchillo, File)