NEW YORK (AP) — Former champion Samantha Stosur is out at the U.S. Open. The 24th-seeded Australian lost to Kaia Kanepi 3-6, 6-3, 7-6 (8) in the second round Thursday. Stosur, who won the 2011 U.S. Open title, holds the distinction as the last woman to beat Serena Williams at Flushing Meadows.Read more on NewsOK.com