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In a rollercoaster first set, Rybarikova had two set points on her serve at 5-4, 40-15, but Hampton rallied and eventually forced a tie-break. In the tie-break, Rybarikova had set points at 6-4 and 6-5, but once again Hampton survived and went on to take the set. The momentum was squarely in her favor at that point and she cruised through the second set in 18 minutes. The 76(7) 60 triumph was just Hampton's third main draw WTA match win and her first over a seed.
Seventh-seeded Johanna Larsson almost joined Rybarikova as a qualifier's upset victim, but outlasted Irena Pavlovic, 46 64 75. The Swede came back from a 5-3 deficit in the third set to snap a five-match losing streak.
Other winners were Alberta Brianti, Olga Govortsova and Evgeniya Rodina. Brianti let a 5-2 second set lead slip away but was a 76(5) 57 61 winner over Mirjana Lucic. Govortsova overcame five set points against her in the second set of her 61 75 defeat of Vesna Dolonts. Rodina had the most lopsided scoreline of the day in beating Irina Falconi, 61 63.
No.1 seed Nadia Petrova is among those in first round action on Monday. Also on the schedule are a couple of promising American teenagers - 17-year-old Madison Keys and 18-year-old Sloane Stephens, who is the youngest player in the Top 100.