Posted June 01, 2013 on AP on Fox

NEW YORK - SEPTEMBER 05: Dinara Safina of Russia reacts after a play to Petra Kvitova of the Czech Republic during day six of the 2009 U.S. Open at the USTA Billie Jean King National Tennis Center on September 5, 2009 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Jim McIsaac/Getty Images)
Jamie Hampton of the United States stunned 2011 Wimbledon champion Petra Kvitova of the Czech Republic 6-1, 7-6 (7) at the French Open on Saturday to reach a Grand Slam fourth round for the first time. The 54th-ranked Hampton needed only 13 winners because the seventh-seeded Kvitova finished with 33 unforced errors, 15 more than the American. Kvitova was a French Open semifinalist in 2012. Hampton joined 67th-ranked Bethanie Mattek-Sands and No. 17-seeded Sloane Stephens, who both won earlier Saturday, and No. 1 Serena Williams, who won Friday, in the fourth round. That gives the U.S. its most women at this stage at Roland Garros since 2004, when there were also four. Five U.S. women made it to the fourth round in Paris in 2003.
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