Belgian Kim Clijsters believes she still has plenty of work to do if she's to claim her farewell Wimbledon.
She's through to the final 16 of the grass court grand slam after Vera Zvonareva was forced to retire with illness during their third round match, trailing 6-3, 4-3.
Clijsters, who's reached the semi-finals twice at the All-England club says she'll need to be better.
She was consistent, but she was far from happy when she came off court.
The world number 47 meets eighth seeded German Angelique Kerber in the next round.
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