Rafael Nadal beats Jack Sock at Roland Garros

The omens had looked rather foreboding for Sock even before he stepped on court for the fourth round encounter - with his rival holding an 11-0 win-loss record against Americans on clay.

Sock's hopes of stalling that run looked all but over within the opening exchanges of the contest when he fell 3-0 behind to the nine-times champion.

The 22-year-old unexpectedly snatched the third set from Nadal but that only delayed the inevitable as the Spaniard became the first man to win a record 70 matches at Roland Garros when he fired down an unreturnable serve.

The Spanish sixth seed, bidding to become the first man to win 10 titles at the same grand slam, will next face Djokovic.

The winner of the match will not be Roland Garros champion. He will be a semi-finalist... that makes a big difference," Nadal said looking ahead to their 44th meeting.

"Novak is probably the favourite here but I am here to fight."

Nadal likes nothing better than a good scrap and 2015 has not exactly been a stellar year by his own high standards - as the Spaniard arrived at Roland Garros without winning a European claycourt event for the first time in a decade.

His on court woes led many to speculate that this could be the year that Nadal is handed only his second defeat in Paris - following the shock Robin Soderling delivered in the fourth round in 2009 - but so far those fears have proved unfounded.