PARIS (AP) -- Once Agnieszka Radwanska was able to hold her serve, it got easy.
Radwanska and Zhang Shuai traded breaks Sunday in the opening seven games of their match, but the third-seeded Pole finally held and won the final nine games to become the first player to reach the second round at the French Open, winning 6-3, 6-0.
''So many breaks in a row,'' said Radwanska, who blamed her struggles on the wet court on an overcast day at Roland Garros. ''I don't know if there is really any explanation why there was eight breaks in a row, but I guess it happens sometimes.''
Radwanska reached the Wimbledon final in 2012, but her best result at Roland Garros was a spot in the quarterfinals last year.
''Clay is not really my favorite surface, but I'm trying,'' Radwanska said. ''Last year I did my first quarterfinal, so hopefully this year I can do even better.''
Later on Day 1 at Roland Garros, Roger Federer was playing Lukas Lacko of Slovakia, and top-seeded Serena Williams was to play Alize Lim of France.
Radwanska started her match with a break to a take a 1-0 lead, but her serve failed her moments later when Shuai was able to even the score. The same happened over the next four games.
But after a fourth break, Radwanska finally held to make it 5-3.
''When I just broke myself in the end of the first set I think was more confident, and then I think I start to play much better,'' Radwanska said.