- No 10 seed taken to first-set tie-break by Anastasia Potapova
- Concern for Ash Barty after world No 1 pulls out of doubles
Serena Williams overcame a shaky start to book an Australian Open fourth-round berth at Melbourne Park, while Ash Barty withdrew from the doubles competition amid concerns the world No 1’s thigh strain is more serious than she is letting on.
Seven-times champion Williams had to save two set points in the first set before recording a 7-6, (7-5) 6-2 win over Russian Anastasia Potapova on Friday.
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