Defending champions Djokovic and Muguruza among French Open winners

Meanwhile, Rafael Nadal took the first step toward a 10th title at Roland Garros with his 6-1, 6-4, 6-1 defeat of Benoit Paire, running his record at the event to 73-2.

He will take on Netherlands' Robin Haase in his next match but after being broken twice by Paire on Monday, he insists there is one key area he needs to improve on.

"I'm very happy to be back here after what happened a year ago".

While Djokovic, seeded second, went on to see off Granollers in straight sets, the 6-3, 6-4, 6-2 scoreline didn't say the whole story, with Granollers making it quite hard for Djokovic, particularly in the second set.

There was more Spanish success as nine-time victor Rafael Nadal began well in his quest for a first major title since his last French Open victory in 2014.

While Djokovic embarks on a new chapter with Agassi, Nadal, in one way, is closing a chapter with his main coach, his uncle Toni, at Roland Garros: He isn't expected to travel with Nadal in 2018.

Next up for the reigning champion is Joao Sousa after he came from a set down to beat Janko Tipsarevic on Court 18.

With new coach Andre Agassi watching from the stands, the second-seeded Serb dispatched clay-court specialist Marcel Granollers 6-3, 6-4, 6-2 to reach the second round of the clay-court major on Monday.

Croatian Marin Cilic, the seventh-seed, beat Latvia's Ernests Gulbis 6-3 6-3 6-3.

Second seed Karolina Pliskova won for just the third time in six visits to Roland Garros with a 7-5, 6-2 victory over China's Zheng Saisai.

"If I feel fresh and energized and excited to play for a week", he said, "that's when I do my best".

Agassi has been tempted into coaching for the first time by the defending French Open champion but must leave Paris well before the tournament finishes.

"I felt good on court played the important points well". He'll have quite the tough draw along the way but started off with quite the demolition of Bernard Tomic, winning 6-4, 6-0, 6-1.

Estonian Anett Kontaveit, who herself has made waves with a string of fine performances this year, faces defending champion and fourth seed Garbine Muguruza, hoping to repeat her winning performance against the Spaniard in Stuttgart in April.

"I played my game, which means being aggressive and going forward". "Not remembering how I played past year".

But Mladenovic looked in massive trouble against Jennifer Brady, eventually fending off back pain en route to a 3-6, 6-3, 9-7 victory over the American. Raonic fired 15 aces and 44 winners to book a meeting with Brazil's Rogerio Dutra Silva, who saved two match points before overcoming Mikhail Youzhny of Russian Federation in five sets. Roanic, the current world No. 6, is seeking his first Grand Slam singles title.

Ninth-seed Alexander Zverev's first-round match against Spain's Fernando Verdasco was suspended due to rain and poor light. The 20-year-old Zverev defeated Djokovic in Rome a week ago to become the first player born in the 1990s to land a Masters title.

  • Julie Sanders