PARIS (AP) Fifth-seeded Caroline Wozniacki of Denmark was knocked out of the French Open on Thursday after losing her second round match to Germany's Julia Goerges in straight sets.
Wozniacki, a former No. 1 and two-time finalist at the U.S. Open, has never advanced beyond the quarterfinals at the French and struggled throughout against the 72nd-ranked German.
Goerges advanced to the third round following a 6-4, 7-6 (4) win.
''I haven't beaten a top-10 player for a long time,'' Georges said. ''I just told myself to be aggressive.''
In the men's side of the draw, fifth-seeded Kei Nishikori of Japan became the first player to reach the second week of the tournament.
Nishikori was supposed to play Benjamin Becker in the third round on Friday, but Becker pulled out of the tournament Thursday because of a muscle tear in his right shoulder.
In other men's second-round play, U.S. Open champion Marin Cilic of Croatia, seeded ninth, had 10 aces as he advanced with a 7-6 (3), 6-1, 6-1 win against Italian qualifier Andrea Arnaboldi.
Leonardo Mayer of Argentina, seeded 23rd, won 6-4, 6-4, 6-7 (1), 6-1 against big-serving Jerzy Janowicz of Poland and Spaniard Pablo Andujar got the better of No. 22 Philipp Kohlschreiber of Germany 6-1, 7-6 (5), 3-6, 3-6, 6-4.
Nine-time champion Rafael Nadal of Spain was in action later Thursday when he faced countryman Nicolas Almagro; top-ranked Novak Djokovic of Serbia takes on Luxembourg's Gilles Muller and third-seeded Andy Murray was facing Portugal's Joao Sousa.
In other women's second-round play, two-time Wimbledon champion Petra Kvitova of the Czech Republic won 6-7 (4), 6-4, 6-2 against Silvia Soler-Espinosa of Spain, while No. 10 Andrea Petkovic of Germany - a semifinalist last year - also rallied to beat Spaniard Lourdes Dominguez Lino 4-6, 6-4, 6-4.
Later Thursday, top-ranked Serena Williams was up against Germany's Anna-Lena Friedsam.