What to know

• NEW YORK — Even Coco Gauff had to applaud a couple of times when her opponent hit some nifty shots. There was the ball that Zeynep Sonmez tracked down deep in the corner and hit down the line on the run. There was a volley with unusual spin that just cleared t...S1
• Coco Gauff began her bid for a second US Open title with a nerveless win over Zeynep Sonmez. The American fourth seed, champion in 2023, was tested in the second set by Turkish outsider Sonmez but came through 6-3, 6-4.S2
• Coco Gauff opened her quest for a second U.S. Open title on Tuesday by beating Zeynep Sonmez 6-3, 6-4, regaining control of midway through the second set after her opponent from Turkey picked up her play.S3