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"I do think the level and the power that a lot of the women bring is higher than maybe in the past, and it's higher at a consistent level," she said. "If I want to be able to compete with these girls, I'm going to have to be the fittest that I ever have been and to be able to move like I did in the past."
7 years after 2nd 'retirement,' Clijsters returns to tennis →
