Rafael Nadal has joined Roger Federer as a seeded survivor at the upset-plagued Miami Masters tennis tournament as he defeated David Nalbandian in three sets for a fourth-round berth.
The top-seed Federer and fourth-ranked Nadal are all that's left of the top four seeds after Novak Djokovic and Andy Murray were knocked out in the second round.
In the women's draw , the US Open winner Kim Clijsters, seeded 14th, hammered Israel's Shahar Peer 6-0- 6-1 and Australia's French Open semi-finalist Samantha Stosur came back from a set down to defeat Virginie Razzano of France.
The 11th seed Vera Zvonareva eliminated Sara Errani sets and another Russian, Anastasia Pavlyuchenkova, beat Errani's Italian compatriot Francesca Schiavone , also in straight sets.
