American teen Sloane Stephens and Maria Sharapova advanced on Friday, while Ana Ivanovic lost in the third round of the French Open.
Stephens reached the fourth round by beating Mathilde Johansson of France 6-3, 6-2. Of the eight teenagers in this year's draw, the 19-year-old Stephens was the only one to even reach the third round.
''I'm excited because now I'm going to have more Twitter followers,'' Stephens said.
The second-seeded Sharapova defeated Ayumi Morita of Japan 6-1, 6-1 in a match postponed a day by the marathon contest between American John Isner and Frenchman Paul-Henri Mathieu.
Sharapova has won three major titles in her career, but she still needs to win at Roland Garros to complete a career Grand Slam.
Ivanovic fell to Sara Errani of Italy 1-6, 7-5, 6-3.
The 13th-seeded Ivanovic, a former top-ranked player who won the French Open title in 2008, committed 37 of her 40 unforced errors in the final two sets. Errani had only 18.
''In the third set I was creating a lot of opportunities and missing a lot of easy, easy finishing balls,'' Ivanovic said. ''That's something that I'm not really happy about.''
Two days after eliminating Venus Williams from the French Open, third-seeded Agnieszka Radwanska was routed by 2009 champion Svetlana Kuznetsova 6-1, 6-2.
She didn't look anything like the player who overwhelmed seven-time Grand Slam champion Williams in straight sets on Wednesday.
Serena Williams' French Open is officially over after a first-round loss in mixed doubles to go with her quick exit in singles.
Playing together for the first time, Williams and Bob Bryan were beaten 7-5, 3-6, 10-6 by Gisela Dulko and Eduardo Schwank of Argentina.
Radwanska has been having a stellar year on tour, winning three titles and moving up to a career-high No. 3 ranking last month. But she is the only player in the top 10 that has never reached a Grand Slam semifinal.
Radwanska dropped to 3-10 against the Russian, including her only two losses in tournament finals.
''It's always disappointing when losing in the first week of a Grand Slam, that's for sure,'' Radwanska said. ''Today I didn't play bad, she was just playing unbelievable.''
Before Friday's match, Radwanska had been 38-7 in 2012, with six of those losses coming against top-ranked Victoria Azarenka.
Kuznetsova, who also won the U.S. Open in 2004, has struggled since winning the title at Roland Garros three years ago, only reaching one Grand Slam quarterfinal.
Again far from his best, Roger Federer still managed to win at the French Open.
Novak Djokovic and Azarenka, the top-ranked man and woman, had much easier paths.
Federer, the 2009 champion at Roland Garros, was pushed to four sets Friday for the second straight match, this time beating Nicolas Mahut of France 6-3, 4-6, 6-2, 7-5 in the third round.
''I think for bigger guys it's about, if you're able to move them around enough and they have to defend time and time again, this is maybe where you can expose some of their weaknesses potentially,'' Federer said. ''I thought he did well. (I) struggled a little bit, but overall obviously I'm happy I came through.''
Federer improved his record number of Grand Slam match victories 235. The 16-time Grand Slam champion is trying to become the first man over 30 years old to win a major title since Andre Agassi in 2003 at the Australian Open.
For Mahut, it was the first time he won a set against Federer in four matches.
''I was believing in it. I was maybe a bit nervous going into that center court, but this went well,'' Mahut said. ''But I'm disappointed, because you always want to do better. Disappointed I didn't win that fourth set.''
Djokovic also advanced to the fourth round, extending his Grand Slam winning streak to 24 by beating Nicolas Devilder of France 6-1, 6-2, 6-2 in a match that ended just as the sun was setting.
''Last 15 minutes was very hard,'' Djokovic said. ''It was very important for me to finish the match today. I wouldn't like to come back tomorrow and play a few games.''
No. 5 Jo-Wilfried Tsonga of France, No. 7 Tomas Berdych of the Czech Republic and No. 9 Juan Martin del Potro of Argentina also won, while No. 11 Gilles Simon lost.
Sloane Stephens of the U.S. reached the fourth round, beating Mathilde Johansson of France 6-3, 6-2. Of the eight teenagers in this draw, the 19-year-old Stephens was the only one to even make it to the third round.
''I'm excited because now I'm going to have more Twitter followers,'' Stephens said.
She will next play No. 6 Sam Stosur, the 2010 runner-up, who defeated Nadia Petrova 6-3, 6-3.
