Former No. 1 Plíšková faces stumbling block in comeback: Australian Open champion Keys

Karolína Plíšková is making a comeback, and the tennis world's former No. 1-ranked woman is at the Australian Open and doing it the hard way. Plíšková is coming off surgery on her left ankle following an injury, played only three matches last year after much longer than expected recovery, and now she's preparing for a third-round match against defending Australian Open champion Madison Keys. Then she got by 23-year-old Indonesian Janice Tjen 6-4, 6-4 on Thursday to set up the match with Keys.

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