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Reigning Wimbledon and US Open champion Serena Williams has withdrawn from the China Open because of flu while her sister Venus has also pulled out, citing a back injury, organisers saidu00a0yesterday. Serena, who confirmed her place among the tennis greats this year by raising her Grand Slam haul to 15 and winning Gold at the London Olympics, pulled out late on Thursday, just two days before the start of the first round.
