Serena Williams demolished Poland's Agnieszka Radwanska to reach the final of the WTA Championships.
Williams roared through her round robin group, winning all three matches, and proved unstoppable again in a 6-2 6-1 victory that set up a final against Maria Sharapova.

Sharapova beat Victoria Azarenka, who will finish the year as No 1 in the rankings, with similar ease 6-4 6-2.