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Top Seeds Defeated at Sony Ericsson Tennis Open


Both top seeds at the Sony Ericsson Open in Miami, Florida have lost in rematches against players who recently won similar upsets.

Guillermo Canas of Argentina beat world No. 1 and top seed Roger Federer of Switzerland for the second time this month, 7-6, 2-6, 7-6. Two weeks ago, Canas ended Federer's 41-match winning streak at Indian Wells. The Argentine repeatedly chased down shots and forced the two-time defending champion into 51 unforced errors.

Also Tuesday, Australian Open tennis champion Serena Williams of the United States easily defeated top-seeded Maria Sharapova of Russia. The 13th-seeded Williams overpowered Sharapova, 6-1, 6-1, in a rematch of their Australian Open final earlier this year. Williams next faces No. 8 Nicole Vaidisova of the Czech Republic for a berth in the last eight.

Meanwhile, ninth-seeded Russian Anna Chakvetadze advanced to the semifinals, battling from behind to beat No. 15 Li Na of China, 4-6, 7-5, 6-2.

In men's play, 12th-seeded Andy Murray of Britain fought off two match points and rallied for a 2-6, 7-5, 6-3 win over Frenchman Paul-Henri Mathieu. In the quarterfinals he will play third-seeded American Andy Roddick, a 7-5, 6-3 winner over and Spaniard David Ferrer.

Tommy Robredo of Spain, seeded sixth, ousted Czech Radek Stepanek, 7-6, 5-7, 7-6. Juan Ignacio Chela of Argentina defeated American qualifier Amer Delic, 6-3, 6-2.

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