BEIJING (AP) — World No. 1 Serena Williams served 10 aces in her 6-4, 7-5 victory over Italy's Francesca Schiavone on Tuesday, moving into the third round of China Open.

It was Williams' third straight sets victory against her Italian opponent on hard court this year with earlier wins coming at the US Open and at the Toronto Open.

Williams sent down six aces in the first set only before Schiavone fought back hard in the second set and broke the American's serve three times. But Williams responded with breaks of her own to clinch the victory.

Williams' chances of winning the tournament were boosted by the surprise loss of defending champion Victoria Azarenka on Monday.