Gauff digs deep and Sabalenka channels Nadal in dramatic second-round wins

American recovers from 7-4 down in deciding tie-breakTop seed says Netflix documentary is inspirationIt hardly seems possible that seven years have passed since a 15-year-old Coco Gauff announced herself on the world scene with a brilliant victory here over Venus Williams in the first round. Gauff has since won two grand slam titles and been ranked as high as world No 2.Her form has been up and down, her serve and forehand occasionally brittle, especially when the pressure is ramped up. But ther