(The Associated Press) Maria Kirilenko has advanced to the quarterfinals of the Australian Open after 2009 finalist Dinara Safina retired in the first set of their fourth-round match with an apparent leg or back injury.No. 2 Safina was facing set point, trailing 4-5 and serving at 30-40, when she limped to her changeover chair for a few moments, then walked up and shook Kirilenko's hand.