India, Feb. 27 -- A clinical South Africa outclassed West Indies by nine wickets in their Super 8 clash to stretch their unbeaten run and all but seal a place in the semifinals of the T20 World Cup on Thursday.

A dominating show by the Proteas pacer was followed by authoritative batting. Yet again, South Africa executed their plans perfectly to further their cause, racking up their sixth win on the trot and halting West Indies' unbeaten run in the tournament.

With South Africa taking two vital points off the West Indies, hosts India now have their qualification hopes firmly in their own hands, as a Proteas defeat would have dented their chances severely. The loss hurt the Caribbean side's net run rate that came down to 1.791 from a heal...