New York: Maria Sharapova booked her US Open third-round berth on Wednesday with a gritty three-set victory over Alexandra Dulgheru as US men produced an historic low in their home Grand Slam.

Sharapova, who lifted her fifth Grand Slam title at the French Open this year, fought back from a set down to beat 95th-ranked Romanian Dulgheru 4-6, 6-3, 6-2.