The Proteas have already won the best-of-three series but they look on course to make it a whitewash after taking four wickets in 28.4 overs on Friday.
Sri Lanka lose four quick wickets in third Test against South Africa
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Sri Lanka reach stumps on day two of the third Test match with South Africa on 80-4, still 346 runs behind their hosts.
Root 'available for start of ODI series'>
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