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Although it's no surprise that Selena Williams got to the fourth round, the presence of three other American women is.
Victories by Jamie Hampton and Bethanie Mattek-Sanders over top-10 opponents were among the biggest upsets of the week and would have been included on this list were it not for the accomplishments of the American women as a group.
The last time as many as four females from the United States got to the Round of 16 at the French Open was 2004. Few were surprised to see that quartet of Venus Williams, Serena Williams, Jennifer Capriati and Lindsay Davenport in the fourth round.
It's different this time.
Sloane Stephens' presence in the fourth round might not seem like a surprise, since the 20-year-old is ranked 17th, got to the fourth round of the 2012 French Open and was a semifinalist at the Australian Open this year. But she had lost in the first round in five of her past eight tournaments, including losses to three players ranked outside the top 50.
Hampton, 23, is ranked 54th and had lost in the first round of last year's French Open. She gained confidence with a good showing in Brussels leading up to the French Open, then upset No. 25 seed Lucie Safarova in the first round in Paris, 7-6, 3-6, 9-7.
Hampton's bigger accomplishment came in the third round, when she upset 2011 Wimbledon champion and 2012 French Open semifinalist Petra Kvitova in straight sets. The victory over the No. 7-ranked Kvitova was Hampton's first over a top-10 player.
But the biggest win of the quartet belonged to Mattek-Sanders, who knocked off 2011 French Open champ and No. 6 seed Li Na in a rain-interrupted, three-set, second-round match.
Now 28 and ranked 67th, Mattek-Sanders seemed to be on her way out of tennis when her ranking fell out of the top 250 last August. Now, after a third-round win over Paula Ormaechea, she is in the Round of 16 at the French Open, surprising crowds as much with her playing outfits (colorful long-sleeved shirts, knee-high black socks) as with her success.