NEW YORK (Reuters) - Dutch qualifier Botic van de Zandschulp continued his storybook march at the U.S. Open on Sunday by outlasting Argentine battler Diego Schwartzman 6-3 6-4 5-7 5-7 6-1 to reach his first Grand Slam quarter-final.

After rolling through the opening two sets, the 25-year-old Dutchman had looked poised for smooth passage into the last eight but in the end needed five sets, five match points and four hours and 20 minutes to tame the 11th seed.