New York: Maria Sharapova's 10th US Open ended in defeat to fellow former world number one Caroline Wozniacki, leaving the women's draw with just two of its top eight seeds. Also exiting on an afternoon of high humidity, which eventually descended into an early evening of lightning and torrential rain, was Spanish fourth seed David Ferrer, the highest-ranked casualty in the men's event.

Five-time Grand Slam champion Sharapova -- the 2006 title winner in New York -- was defeated by Danish 10th seed Wozniacki with the 2009 runner-up claiming a deserved 6-4, 2-6, 6-2 triumph on a steamy Arthur Ashe Stadium court to reach the quarter-finals yesterday. Sharapova, looking to add this year's US Open title to her French Open win in June, was undone by 43 unforced errors and eight double faults.