MELBOURNE, Australia -- Rafael Nadal's bid to win four straight Grand Slam tournaments is over. The injured Nadal lost for the second straight year in the Australian Open quarterfinals, going down 6-4, 6-2, 6-3 Wednesday to fellow Spaniard David Ferrer. Nadal, who appeared to have tears in his eyes during a changeover while trailing 3-0 in the third set, took a medical timeout for an apparent leg injury after three games. He was clearly out of sorts, failing to chase down balls that he would ordinarily return easily. "This is a difficult day for me," Nadal said. "Today I can't...