With her work-in-progress serve looking the best it has so far in this trip to Flushing Meadows, No. 3 seed Coco Gauff turned in by far her most solid -- and stress-free -- performance Saturday, defeating No. 28 Magdalena Frech 6-3, 6-1 to reach the second week of the US Open for a fourth consecutive year.

Gauff, 21, will be making her 16th appearance in the round of 16 at a major, breaking a tie for the second-most such appearances by an American woman before her 22nd birthday in the Open era, behind only Venus Williams (17).

After two difficult wins under the lights at night in Arthur Ashe Stadium, Gauff got the schedule started with an 11:30 a.m. match. -- with shade covering nearly half of the court on a cloudless morning.

"It was kind of hard to see the ball," Gauff said, "bu

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