World No.2 Caroline Wozniacki has ended Samantha Stosur’s US Open campaign before it really started.

Undone by eight double-faults and 34 unforced errors, Stosur crashed to a 6-3 6-2 first-round loss to the reigning Australian Open champion in more oppressive heat at Flushing Meadows.

Champion in 2011, Stosur missed last year’s event with a wrist injury and lasted just 84 minutes on Tuesday, leaving Ashleigh Barty, Daria Gavrilova, Ajla Tomljanovic and Lizette Cabrera to fly the Australian flag in the women’s singles.