Djokovic eases through; Azarenka out

Serbian star Djokovic had little trouble in reaching round two, though, seeing off Brazilian world number 134 Rogerio Dutra Silva 6-3 6-4 6-4.

The 12-time Grand Slam champion dropped serve three times and will have to markedly improve to challenge Rafael Nadal in the latter stages of the tournament, but he was still far too good for Dutra Silva on Court Philippe Chatrier.

"It was good to start this year with a win. I wasn't at my best, he played with a lot of spin. I didn't play very well, but I won in three sets," said the 20th seed, who will next face David Ferrer or Jaume Munar.

Former world number one Victoria Azarenka's return to Grand Slam tennis lasted just two sets as the Belarusian slumped to a 7-5 7-5 loss to Katerina Siniakova. Azarenka, who missed much of last season after being embroiled in a custody battle over her son, was broken to love in the 12th games of each set to be dumped out by the Czech world number 57.

It was Azarenka's first Grand Slam match since losing to Simona Halep in the Wimbledon fourth round last July, but she still believes she can return to the top of the game.

"No doubt about it. Maybe not today, but no doubt about it," the now-world number 82 insisted.

Petra Kvitova also found life hard, but the two-time Wimbledon champion fought back from a set down to beat Paraguay's Veronica Cepede Royg 3-6 6-1 7-5 on Court Philippe Chatrier.

The 28-year-old Kvitova is one of the favourites to win a maiden Roland Garros title after winning four titles this season, including on clay in Prague and Madrid.

"I've won 12 matches straight on clay, but I'm still a long way from Rafa," she said in reference to Rafael Nadal's upcoming bid for an 11th men's singles crown.