Fourth-seeded Coco Gauff advanced to the fourth round of the US Open on Saturday, turning back Spain’s Cristina Bucsa in straight sets. On a brutal day for American stars at the U.S. Key points and original sources are listed below.

• Fourth-seeded Coco Gauff advanced to the fourth round of the US Open on Saturday, turning back Spain’s Cristina Bucsa in straight sets. Gauff, the 2023 US Open champion, topped the 40th-ranked Spaniard 6-3 6-4 in 88 minutes, charging the net on match point and...S1

• On a brutal day for American stars at the U.S. Open, Coco Gauff offered a bright spot.S2