Williams sisters face most dreaded obstacle

Serena and Venus Williams, who have qualified together for only the second time for the WTA Championships, find themselves with their most dreaded obstacle as they seek to reach the final of the women's tour climax.

The highest profile sisters in sport are keen to show that, not only are they the best players of this decade, but they are in the process of joining the pantheon of all-time greats.

DOHA, Nov 3, 2008. AFP