Defending champion Li Na crashed out of the French Open on Monday while Maria Sharapova survived a deluge of errors on a bitterly cold day in Paris to struggle into the quarter-finals.

Nadal demolished Juan Monaco of Argentina 6-2, 6-0, 6-0 in an awesome display of claycourt tennis that must have sent shivers through his rivals for the title here.

Countrymen David Ferrer and Nicolas Almagro had earlier gone through comfortably.

Sixth-seeded Ferrer cruised past countryman Marcel Granollers 6-3, 6-2, 6-0, and 12th seed Almagro pushed aside Janko Tipsarevic of Serbia 6-4, 6-4, 6-4.

Murray then joined them with a disjointed 1-6, 6-4, 6-1, 6-2 win over Frenchman Richard Gasquet.