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Eastern Province caused the first major upset at Paarl Golf Club by beating defending champions Western Province in the A division.
After a crushing defeat to Central Gauteng on Monday, the Eastern Province side rebounded with a strong performance to beat Province 7-5.
In the B-section, Mpumalanga strengthened their bid for promotion at this year's South African Junior Interprovincial by bagging two crucial second round victories over North West and Border.