Defending champion Coco Gauff says she is treating this year's US Open as a "victory lap" after comfortably beating Varvara Gracheva in her opening match.
Gauff, 20, began her title defence with a 6-2 6-0 victory in just 66 minutes on Arthur Ashe Stadium.
The American beat Aryna Sabalenka in last year's final to win her first Grand Slam and followed that by reaching the semi-finals of the Australian Open and French Open earlier this year.
But she has struggled for form recently, losing in the third round of the Paris Olympics before suffering early exits at tournaments in Cincinnati and Toronto.