Williams sisters advance in Miami

Serena Williams moved into the fourth round of the Sony Ericsson Open with a straight-sets victory over Sam Stosur on Monday.



The 30-year-old lost the final of last year's US Open to the Australian but was in no mood for a repeat performance and secured a 7-5 6-3 victory in Miami.

The 13-time Grand Slam winner looked in good nick and will now face former world number one Caroline Wozniacki, who took care of Yanina Wickmayer 7-6 (8-6) 6-0 in round three.Williams fell apart at Flushing Meadows in 2011 and blotted her copybook after becoming involved in a heated debate with the umpire.But despite the memory of that defeat, the Florida resident made it clear that she did not go into the contest looking for revenge and admitted she was more than happy with her serve after sending down 20 aces.

"That wasn't in my mind," she told a press conference after the match."I just thought, 'This is a new game'. My serve was hot."

Sister Venus also progressed as she shocked 15th seed Ana Ivanovic with a 6-7 (4/7) 6-2 6-2 victory over the Serb, while world number one Victoria Azarenka came from a set and two breaks down to beat 16th seed Dominika Cibulkova 1-6 7-6 (9/7) 7-5.Second seed Maria Sharapova was also a straight-sets winner but had to battle past a dogged Ekaterina Makarova - the Russian running out a 6-4 7-6 (7/3) victor over her compatriot in Key Biscayne, and she now faces French Open champion Li Na.Fifth seed Agnieszka Radwanska has ended the run of Spanish teenager Garbine Muguruza Blanco, winning 6-3 6-2, with seventh seed Marion Bartoli proving far too good for Maria Kirilenko with 6-1 6-2 triumph.