Sharapova, American Stephens win at French updated 9:00 a.m. PARIS - 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 reach the third round. 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. 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. 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.