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Serena Williams moved into the Rogers Cup semi-finals on Friday with a maiden career victory over Naomi Osaka in their first meeting since the American's infamous row with an umpire overshadowed last year's U.S. Open final. The 6-3 6-4 loss continued a run of poor form for Osaka but there was some good news later in the day when Karolina Pliskova lost to ensure the U.S and Australian Open champion would replace Ash Barty as world number one next week. Williams will next face qualifier Marie Bouzkova, who advanced when Wimbledon champion and holder Simona Halep retired from their match with a left Achilles problem after dropping the first set 6-4.