Serena knocked out of Madrid Masters

Top-ranked Serena Williams was knocked out of the Madrid Masters on Wednesday, falling 4-6, 6-2, 6-3 to Nadia Petrova of Russia in the third round.

Top-ranked Serena Williams was knocked out of the Madrid Masters, falling 4-6, 6-2, 6-3 to Nadia Petrova of Russia in the third round.

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Petrova, who has won 19 doubles titles, on Wednesday frustrated Williams into making 41 errors by hitting accurately from the baseline. The 16th-seeded Petrova served 10 aces to advance to the quarterfinals.

Second-seeded Rafael Nadal advanced to the third round with a 6-4, 6-3 win against Ukrainian qualifier Oleksandr Dolgopolov Jr.