Juan Martin del Potro to face John Isner in U.S. Open quarters

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NEW YORK  — No. 3 seed Juan Martin del Potro continued his easy march through the U.S. Open, beating No. 20 Borna Coric 6-4, 6-3, 6-1 to reach the quarterfinals for the third year in a row.

The 2009 tournament champion has won all 12 sets he’s played at Flushing Meadows so far in 2018.

Against Coric, del Potro produced 18 of his 33 winners with his powerful forehand.

The key came early, when del Potro broke in the last game of the opening set.