Serena and Venus Williams stayed on course for a third round meeting at the French Open with dominant victories on day one.
Defending champion Serena was drawn against close friend Alize Lim in the first round - the pair having met through coach Patrick Mouratoglou - and the American did appear nervous to start with.
Two years ago Serena lost in the first round at a grand slam for the first time against another Frenchwoman, Virginie Razzano, but an upset never looked on the cards despite the world No 1's occasional waywardness.
She made 36 unforced errors and endured a lengthy final game before wrapping up a 6-2 6-1 victory on her fifth match point.
Next Serena will play either Spaniard Garbine Muguruza or fellow American Grace Min, then after that a clash against Venus beckons.
The 33-year-old had a tough draw against Swiss Belinda Bencic, virtually half her age and last year's junior champion here and at Wimbledon.
The 17-year-old, who was two months old when Venus played her first French Open, has made rapid strides in the senior game and is already ranked in the top 100.
Her career has been overseen by Melanie Molitor, the mother of Martina Hingis, who was courtside to watch the teenager.
Bencic matched Venus for virtually the whole of the first set but the veteran's extra power eventually told and she ran away with the second to win 6-4 6-1, her first victory at Roland Garros for two years.
Should the sisters play each other, it would be their earliest ever meeting outside of the round-robin Tour Championships.
Third seed Agnieszka Radwanska is also through to the second round after a 6-3 6-0 success over China's Zhang Shuai.
It appeared Radwanska could be in for a tough day when the first seven games all went against serve.
However, the Pole finally held for a 5-3 advantage and she never looked back, winning the remaining seven games to secure victory.
Zhang made 24 unforced errors as she slipped to defeat, with the latest reverse meaning the world No 34 has lost all four of her first round matches at Roland Garros.
"So many breaks in a row," said Radwanska. "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 quarter-finals last year.
"Clay is not really my favourite surface, but I'm trying," she added. "Last year I did my first quarter-final, so hopefully this year I can do even better."
Eighth seed Angelique Kerber made it safely through to round two after a simple 6-3 6-1 victory over Katarzyna Piter.
However, former champion Francesca Schivone was sent crashing out after suffering a 6-3 6-3 defeat to Ajla Tomljanovic.
Schiavone took the title at Roland Garros is 2010 but was unseeded for this year's event and bowed out against a player who has never been past the second round of a grand slam.
Number 31 seed Daniela Hantuchova came from behind to beat Jovana Jaksic and progress.
The Slovakian ace lost the first set 6-2 but rallied to take the next by the same scoreline and then won the decider 6-4.