Kyrgios: Nadal knows he is unbeatable at Roland Garros

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Nick Kyrgios says Rafael Nadal knows he is unbeatable at the French Open as the tournament favourite attempts to make history at Roland Garros.

Nadal won three consecutive tournaments on clay before losing to Dominic Thiem at the quarter-final stage in Rome.

The legendary Spaniard started his quest to become the first player to win the same grand slam 10 times in the Open Era with a straight-sets demolition of Benoit Paire on Monday and Kyrgios thinks he will take some beating.

"Nadal, I don't think he's worried at all about anyone in this tournament, to be fair. Best of five [sets], it suits him. He knows he's not gonna lose. Let's be realistic," said the Australian.

Kyrgios has grounds to be optimistic after he defeated Philipp Kohlschreiber 6-3 7-6 (7-4) 6-3 in the first round on Tuesday.

The enigmatic 18th seed has employed Sebastien Grosjean to coach him on a part-time basis and believes the Frenchman can make the difference as he strives to realise his undoubted potential.

"I definitely knew that to get to maybe top five and to really contend at slams I probably needed someone in my corner that could help me at times." said the 22-year-old.

"That definitely came from the people around me. They were always telling me and always reminding me that I had potential and I definitely needed someone to help me.

"I just wasn't ready to have anyone. I was kind of just going with the flow and just taking every day one step at a time, just enjoying it and just trying to play. I got to 13 in the world without a coach, which is not too bad, I don't think.

"I think it's time now to knuckle down, I guess. He's [Grosjean] been there and done that. I think he's gone to three in the world. He's well experienced."