Montreal's Eugenie Bouchard overcame a rain interruption of nearly 90 minutes before moving into the second round of the French Open with a 6-0, 6-2 win over Israel's Shahar Peer on Tuesday.

Bouchard, the 18th seed, beat Peer for the second time this season and fourth in her career over 58 minutes of actual playing time.

The 20-year-old former junior Wimbledon champion arrived to Roland Garros with her highest career WTA ranking. Bouchard moved up to 16th after winning her first WTA title on Saturday, beating Karolina Pliskova in the final of the Nuremberg clay court tournament.

Bouchard had a 3-1 lead in the second set when the weather turned wet. She won the first seven games of the match against Peer, reaching 4-0 in 13 minutes and polishing off the opener in a brisk 27 minutes.

Peer finally won the third game of the second set but was never a threat.

When the pair returned, Bouchard extended her second-set lead to 4-1 and saved a break point for a 5-2 lead before breaking Peer in the final game to advance on a second match point.

Sharon Fichman of Toronto had her match stopped by darkness, and will head into Tuesday with the possibility of a big upset. Fichman won the first set over sixth seed Jelena Jankovic of Serbia, 7-5, but was behind 1-5 in the second when play was called.

Meanwhile, Vancouver's Vasek Pospisil, the 30th seed, went down to defeat in straight sets against Russian Teymuraz Gabashvili, 6-4, 6-2, 6-3.

Top 10 seeds Wawrinka, Nishikori bounced

Playing in his first Grand Slam match since becoming a major champion, Stan Wawrinka lost.

The Australian Open champion was on centre court Monday at the French Open, but he was eliminated in the first round after losing to 41st-ranked Guillermo Garcia-Lopez of Spain 6-4, 5-7, 6-2, 6-0.

Wawrinka had 62 unforced errors and won only 54 per cent of the points on his first serve.

In Melbourne, Wawrinka won his first Grand Slam title, beating Rafael Nadal in the final. He warmed up for the French Open by beating Roger Federer on clay in the Monte Carlo final.

Earlier, Novak Djokovic and Maria Sharapova successfully dealt with the wet weather and their opponents.

Both former No. 1 players advanced to the second round at Roland Garros, playing through rain and rain delays, while current No. 1 Nadal finished off his match in the sunshine.

Djokovic beat Joao Sousa of Portugal 6-1, 6-2, 6-4 despite being broken three times, including while serving for the match for the first time.

In the second set, a short shower stopped play for only a few minutes. Djokovic, wearing a white rain jacket, used the time to entertain the crowd by chatting with a ball boy and letting the youngster sit alongside him on the bench.

At one point, Djokovic grabbed the umbrella out of the ball boy's hand and in return gave him a racket. Then Djokovic handed him a bottle of Perrier, and the two clinked bottles before taking a sip.

"We had a nice chat. He's a tennis player, so I asked him how long he's playing, and how he's enjoying his time as a ball kid," Djokovic said. "It was a nice, fun time, something unusual for the Grand Slams."

Djokovic can complete a career Grand Slam by winning the French Open.

Nadal has already won a record eight French Open titles, but he is looking to become the first man to win five times in a row in Paris.

On Monday, he improved his record at Roland Garros to 60-1 by beating Robby Ginepri of the United States 6-0, 6-3, 6-0.

"Always the same: To win against anyone I need to play at a good level and I need to be ready for fight and for everything that I will need to do to win," said Nadal, looking ahead to his next match.

Sharapova, the 2012 champion, was first on court in the main stadium and needed little more than an hour to beat Ksenia Pervak 6-1, 6-2. She broke Pervak five times and finished with 17 winners, while Pervak had only four.

Sharapova, seeded seventh at the French Open, completed a career Grand Slam at Roland Garros two years ago. She then lost to Serena Williams in the 2013 final.

Up next in Paris will be Tsvetana Pironkova of Bulgaria in the second round. But she could face Williams in the quarter-finals.

"It's tough to think about that match down the line where you have to compete in three matches before that," Sharapova said. "Obviously it's a match that many people always look forward to when we play against each other."

Monday's match started about 1 hour, 20 minutes late because of the wet weather. The forecast calls for more rain for the rest of the week.

Australian Open runner-up Dominika Cibulkova of Slovakia also advanced, beating Virginie Razzano of France 7-5, 6-0.

Other winners include No. 5 Petra Kvitova of the Czech Republic, No. 12 Flavia Pennetta of Italy, No. 16 Sabine Lisicki of Germany, No. 17 Roberta Vinci of Italy, No. 19 Samantha Stosur of Australia, No. 20 Alize Cornet of France, No. 28 Andrea Petkovic and No. 32 Elena Vesnina of Russia.

On the men's side, ninth-seeded Kei Nishikori was knocked out in the first round, losing to Martin Klizan of Slovakia 7-6 (4), 6-1, 6-2. No. 14 Fabio Fognini of Italy, No. 17 Tommy Robredo of Spain, No. 18 Ernests Gulbia of Latvia, No. 25 Marin Cilic of Croatia, No. 26 Feliciano Lopez of Spain, No. 27 Roberto Bautista Agut of Spain and No. 29 Gilles Simon of France advanced.

With files from The Canadian Press