NEW YORK (Reuters) - Experience trumped youth as former champion Sloane Stephens' deadly forehand sealed fellow American Coco Gauff's fate 6-4 6-2 in the second round of the U.S. Open on Wednesday.

The pair appeared evenly matched early in the affair but the 17-year-old Gauff handed Stephens a critical break with a double fault on the last point in the ninth game and never regained the momentum from her 28-year-old opponent.