Defending champion Serena warns she can get even better

MELBOURNE: Defending champion Serena Williams warned her rivals she can get even better despite playing brilliant tennis to crush Samantha Stosur 6-4, 6-2 in the fourth round of the Australian Open yesterday.

Williams wiped the big serving Stosur off the court in just 65 minutes to reach the quarterfinals, where she will play either Victoria Azarenka of Belarus or Russia's Vera Zvonareva.

She remains on track for a semifinal against sister Venus and a possible blockbuster final against Belgium's Justine Henin.