SAMANTHA Stosur lost her second round match at the US Open in New York on Friday.
The Gold Coaster blew two third-set match points against Kaia Kanepi, losing 3-6, 6-3, 7-6.
Casey Dellacqua reached the third round for the first time after being seeded for the first time. She defeated Chinese qualifier Qiang Wang 4-6, 6-4, 6-2 and is expected to play Ana Ivanovic next.
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Fellow Australian Matt Ebden was eliminated in straight sets by 23rd seed Leonardo Mayer.
Nick Kyrgios beat Italian Andreas Seppi in round two, winning 6-4, 7-6, 6-4.