Simon Harmer, right, picked up four wickets as West Indies collapsed in Cape Town

South Africa are on course for a series-clinching victory over West Indies after the tourists collapsed on a rain-shortened fourth day in Cape Town. After the morning and afternoon sessions were lost to wet conditions, West Indies rebounded from the early loss of Leon Johnson and were doing a decent job of frustrating South Africa who knew they needed quick wickets to make up for the time lost in the day.

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