PARIS — The young Federer sisters were in the stands watching daddy win his opening match at the French Open, and the Williams sisters were on separate courts Sunday ensuring their own progress.

Roger Federer had little trouble beating Lukas Lacko of Slovakia 6-2, 6-4, 6-2. As soon as he finished, Serena Williams took over on Court Philippe Chatrier, the main stadium at Roland Garros, and beat Alize Lim 6-2, 6-1.

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Roger Federer gives the thumbs up after defeating Lukas Lacko in the first-round match of the French Open tennis tournament at the Roland Garros stadium, in Paris, France, on Sunday. Federer won 6-2, 6-4, 6-2. The Associated Press

Over on Court Suzanne Lenglen, Venus Williams was also playing, and winning. The older Williams sibling defeated Belinda Bencic 6-4, 6-1.

Serena, the defending champion, could meet Venus in the third round if both get through their next matches.

The French Open is only Federer’s third clay-court tournament this season. He reached the final in Monte Carlo but missed the Madrid tournament when his second set of twins, boys Leo and Lenny, was born.

His first match after their birth was a loss in Rome.

On Sunday, with the clay court hard and damp due to days of rain and overcast skies, the fourth-seeded Federer was back to himself, winning five of his 11 break points.

“I was happy seeing, getting early signs out of the match that I was actually playing well and I was going to get my chances I was looking for,” Federer said. “My personal life, as we know, it’s all great, so I’m happy the family is here.”

Federer’s twin girls, Myla Rose and Charlene Riva, will turn 5 in July. They were sitting in Federer’s box along with his wife, Mirka, at the start.

The French Open is the only Grand Slam tournament to start on Sunday, and Federer played the second match on center court.

“I wasn’t nervous, actually, going into the match. It’s more just like those hints of fear, maybe yesterday, maybe this morning at one point, just for like five seconds, `Oh, I really hope I don’t have to pack my bags today,’ that kind of feeling,” Federer said.

Eighth-seeded Milos Raonic of Canada also advanced, beating Nick Kyrgios of Australia 6-3, 7-6 (1), 6-3.

Raonic is the youngest man in the top 10 of the tennis rankings, and Kyrgios was the youngest man in this year’s French Open draw at 19.

“I was a bit nervous going out in the first set. That’s normal, I think,” said Kyrgios, a former top-ranked junior player who won the junior Australian Open in 2013.

Other men’s winners included No. 6 Tomas Berdych of the Czech Republic, No. 15 Mikhail Youzhny of Russia and Radek Stepanek of the Czech Republic.

Serena Williams dictated most points in her match against Lim, a wild-card entry from France.

The top-seeded Serena is a 17-time major champion who was facing a woman making her Grand Slam debut. Still, there was a bit of shakiness from the 32-year-old American as she served out the final game, erasing four break points and needing five match points to close things.

With the victory, Serena improved to 54-1 in first-round matches at majors. The only loss came at the 2012 French Open against 111th-ranked Virginie Razzano.

Also, Agnieszka Radwanska was able to reach the second round — once she got a handle on her serve.

Radwanska and Zhang Shuai traded breaks 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, winning 6-3, 6-0.

“So many breaks in a row,” said Radwanska, who blamed her struggles on the wet court.

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.”

No. 14 Carla Suarez Navarro of Spain and 31 Daniela Hantuchova of Slovakia also advanced.

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