Emerging Australian teenager Nick Kyrgios has qualified for a grand slam tournament for the first time, joining Casey Dellaqua in boosting Australia's main draw numbers at this week's US Open to eight.

After starting the year ranked 838th, the Australian Open junior champion continues to make an impressive transition to the senior game, beating Tunisian Malek Jaziri from a set down in the final round of qualifying at Flushing Meadows.

The victory came after he saved multiple match points the previous day in a three-hour marathon against experienced ninth seed Joao Souza.

The Canberran, who received Tennis Australia's wildcard into the French Open and stunned veteran Radek Stepanek in the opening round, joins Bernard Tomic, Marinko Matosevic, Lleyton Hewitt and wildcard James Duckworth in the men's draw.

In the women's draw, Casey Dellacqua's qualifying success earns her a place beside 11th seed Sam Stosur and her doubles partner, Ashleigh Barty.

Kyrgios, the world's top-ranked junior, faces a baptism of fire as the youngest player in the 128-man event when he makes his main-draw debut at the hardcourt major starting on Monday.

The 18-year-old, who beat Jaziri 4-6, 6-4, 6-3 in the final round of qualifying at Flushing Meadows on Saturday, will play fourth seed David Ferrer, the vastly experienced Spaniard who lost to Rafael Nadal in this year's French Open final.

With Kyrgios considered one of the most exciting prospects in tennis - and the only teenager in the Flushing Meadows men's draw - the match could well end up being staged under the bright lights of Arthur Ashe Stadium, the biggest arena in world tennis.

Dellacqua also advanced from qualifying on Saturday with a 7-5, 6-4 win over Russian Ksenia Pervak, giving Australia a total of eight representatives in the men's and women's singles.

There could have been 10, but Anastasia Rodionova and Olivia Rogowska both lost in the final round of qualifying.

Dellacqua, in her fifth US Open, will meet Croatian Ajla Tomljanovic in the first round.

Dellacqua's doubles partner Ashleigh Barty takes on Spaniard Estrella Cabeza Candela.

Australia's best hope, 2011 women's champion Samantha Stosur, will launch her bid for a second title against Victoria Duval after the rising American teenager also qualified on Saturday.

In a promising build-up, Stosur has won nine of 11 matches during the US hardcourt swing.

The world No.13 upset second-seeded Australian Open champion Victoria Azarenka in the final in California three weeks ago to snare her first title since beating Serena Williams at Flushing Meadows two years ago.

Stosur is contesting her first tournament since splitting with long-time coach David Taylor last week and will work with Fed Cup captain Alicia Molik while in New York.

Australia's former men's champion Lleyton Hewitt will open against American Brian Baker, with the victor likely to come up against 2009 winner and sixth seed Juan Martin del Potro in round two.

Australian No.1 Bernard Tomic meets Spaniard Albert Ramos in his first match at Flushing Meadows since being accused of tanking against Andy Roddick last year.

Marinko Matosevic, chasing his elusive maiden grand slam match win, squares off against Spanish 19th seed Tommy Robredo, while wildcard James Duckworth makes his US Open main-draw debut against American Tim Smyzcek.

With aap