Serena and Venus Williams and mens world number two Roger Federer cruised into the fourth round of the WTA and ATP hardcourt tournament in Miami but second seed Dinara Safina crashed out.
Reigning Australian Open champion Serena Williams defeated Chinas Peng Shuai 7-5 6-2 on Sunday while US fifth seed Venus Williams,the reigning Wimbledon champion,beat Germanys Anna-Lena Groenefeld 7-5 6-3.
The sisters could meet in a semi-final at this nine million-dollar event,which saw its greatest upset when Australias 42nd-ranked Samantha Stosur stunned Russian second seed Safina 6-1 6-4. Im really happy, Stosur said,I played really well. I executed exactly what I wanted to do.
Safina could have become the womens world number one by winning the title. Its very disappointing. Thats what Im playing for, Safina said. I want to be there. Suddenly I go to court and I dont even fight for it. Champions,they dont do this. Its a good punishment for me.
Federer advanced by beating German 28th seed Nicolas Kiefer 6-4 6-1 to book a fourth-round match against American Taylor Dent,who beat Spanish 15th seed Tommy Robredo 7-5 6-3.
Serbias seventh seed Ana Ivanovic,a finalist one week ago at Indian Wells,also was ousted,falling to Hungarys Agnes Szavay 6-4 4-6 6-1.
Andy Roddick reached the fourth round on Sunday after overcoming two set points in the tiebreaker to beat Dmitry Tursunov of Russia 7-6 (9) 6-2.