LONDON:

South Africa are firm favourites to wrap up a second straight Rugby Championship title for the first time when they face Argentina at Twickenham on Saturday in a competition with an uncertain future.

This year's tournament has been one of the most exciting and unpredictable since Argentina joined South Africa, New Zealand and Australia in the southern hemisphere competition in 2012.

The top the table by a single point heading into the sixth and final round of matches this weekend.

A bonus-point victory against the Pumas in London would guarantee the world champions the title regardless of the result in Perth between Australia and New Zealand earlier on Saturday.

The All Blacks can still emerge victorious if results go their way, though South Africa have a huge points-differenc

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