PARIS - There were moments, as recently as last year, when a body that would not stay healthy and on-court results prompted Bethanie Mattek-Sands to wonder whether it was simply time to call it a career after more than a decade as a professional tennis player.
Instead, Mattek-Sands "stuck it out," in her words, making some significant changes - to her diet after discovering a host of food allergies, to her point-to-point focus. And at age 28, in her 27th Grand Slam tournament, Mattek-Sands earned her most significant victory to date, a 5-7, 6-3, 6-2 upset of 2011 champion Li Na at the rain-soaked French Open on Thursday to join four other American women in the third round.
By beating the sixth-seeded Li to earn her fourth career victory in 25 tries against top-10 players, Mattek-Sands helped give the United States its largest group of women in the third round at the clay-court Grand Slam tournament since six made it in 2004. The five U.S. women left, out of the 15 in the main draw, are the most this far at any Grand Slam tournament since the half-dozen at Wimbledon in 2005.
"We have a lot of talented, young kids," Mattek-Sands said, then added with a wink and a smile, "Obviously, older kids, too."
The other Americans who advanced into the third round: No. 17 Sloane Stephens and 54th-ranked Jamie Hampton, who also won Thursday, and No. 1 Serena Williams and No. 29 Varvara Lepchenko, who won Wednesday.
"Other than Serena, we're all a work in progress. A couple years ago, we were not even here. And so we've definitely taken a step forward and we're still progressing and still trying to make that push," said Hampton.
Up next for the 23-year-old Hampton is No. 7 Petra Kvitova, the 2011 Wimbledon champion. The 20-year-old Stephens, meanwhile, faces 92nd-ranked Marina Erakovic, who beat No. 16 Dominika Cibulkova 6-2, 2-6, 6-4 to become the first woman from New Zealand to reach the French Open's third round.
Stephens, like other players on a wet afternoon, weathered two rain delays during a 6-1, 6-3 victory against Vania King of the U.S.
"You literally have nothing to do," Stephens said. "Should I eat? Do cartwheels?"
Only 18 of 32 scheduled singles matches were completed, with two-time Australian Open champion Victoria Azarenka and 2011 U.S. Open champion Sam Stosur among the winners. Six were suspended in progress - defending champion Maria Sharapova led Canada's Eugenie Bouchard by a set and a break when they stopped - and eight were postponed entirely, including seven-time French Open title winner Rafael Nadal against Slovakia's Martin Klizan.
Last year's runner-up to Nadal, Novak Djokovic, gestured at the dark, threatening sky between points, as if to admonish the clouds for even considering halting play before he could finish a 6-2, 6-0, 6-2 victory over 83rd-ranked Guido Pella of Argentina.
"The most important thing for a player in these interruptions and rain delays is not to get frustrated mentally, because it's a very fine line. ... Your intensity is there, and suddenly they call it off," said Djokovic, who is ranked and seeded No. 1 as he bids to complete a career Grand Slam.
"So it's not easy warming up, cooling off, getting tape, putting off the tape, taking a shower or not taking a shower," he said. "It's unpredictable."