Italy's Flavia Pennetta advanced to her first Australian Open quarter-final with as much relief as delight on Sunday just weeks after suffering a left wrist injury that she thought could rule her out of the Melbourne Park tournament. _0"> Pennetta had reason to be worried after an injury to her right wrist required surgery in 2012, leading her to spend six months on the sidelines, miss last year's Australian Open and watch her ranking drop to 166 by June. "It was a really difficult moment, because I didn't know what I had," the 31-year-old told reporters after she advanced to the quarter-finals following a 6-1 4-6 7-5 victory over ninth-seeded German Angelique Kerber. "I had an MRI (scan) five days after which turned out to be pretty good because my ligament and my tendon were fine," she added of the injury she sustained at the Hopman Cup in Perth and forced her out of the Hobart International. "Just a strain." Pennetta, who has w