This is pretty much all anyone needs to know about defending champion Coco Gauff's 6-3, 4-6, 6-3 loss to Emma Navarro in the U.S. Open's fourth round on Sunday: Gauff wound up with more double-faults, 19, than winners, 14.

It was the latest in a series of early-for-her exits in recent weeks, including bowing out in the third round at the Paris Olympics, then going 1-2 at hard-court tuneup events before arriving in New York.