Sam Stosur won the first 19 points as she began the defence of her US Open title in style with a 6-1 6-1 victory over Croatia's Petra Martic.

The Australian, seeded seventh this year, was a surprise winner over Serena Williams 12 months ago but is under the radar again this time after failing to build on her maiden grand slam title.

She certainly made a statement today, though, leading 21-year-old Croatian Martic 4-0 and 40-0 before she dropped a point, and she was hardly less dominant thereafter.

It took Stosur only 51 minutes to clinch victory and set up a second-round match against either Edina Gallovits-Hall of Romania or Switzerland's Stefanie Voegele.

Spain's 27th seed Anabel Medina Garrigues was an early casualty, though, the clay-court specialist going down 6-3 6-3 to Czech Lucie Hradecka.