Coco Gauff faces Naomi Osaka in a marquee matchup on Monday. Photo: Getty Images The second act of Andrea Petkovic’s career began weeks before COVID took hold in 2020. Pekovic, a former world no. 9, was sidelined off-court with a left-knee injury that required surgical intervention. Her doctor didn’t mince words. “He told me, you will have two to three more years in your knee for competition after this, and if you don’t wanna destroy your knee completely, then you should probably think about [

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