Serena Williams has cruised into the final of the WTA Championships with a 6-2 6-1 win over Agnieszka Radwanska in Istanbul.
The third seed overcame her Polish opponent in just 61 minutes, producing eight aces and converting six of seven break points.
She will now face either Maria Sharapova or Victoria Azarenka in tomorrow's final.
Williams has previously won the Championships twice - in 2001 and 2009.
