Defending champion Rafael Nadal has continued his quest for an 11th French Open title after he secured a quarter-final place with straight sets victory over Maximilian Marterer of Germany.

The world number one defeated unseeded 22-year-old Marterer 6-3 6-2 7-6 (7-4) in their last 16 clash.

He will now battle with 11th seed Diego Schwartzman for a spot in the last four.

The 25-year-old Argentine recovered from two sets down to beat South African sixth seed Kevin Anderson 1-6 2-6 7-5 7-6 (7-0) 6-2 thereby moving into his first French Open quarter-final and the second Grand Slam quarter-final of his career.

His compatriot Juan Martin del Potro is also through to the last eight following a 6-4 6-4 6-4 victory over ninth seed John Isner of the United States and will now face third seed Marin Cilic after the Croat overcame Italian 18th seed Fabio Fognini 6-4 6-1 3-6 6-7 (4-7) 6-3.