"Aaron Cook is back. That 2 1/3-inning meltdown on opening day last week in Arizona? Just a temporary leave of absence. And although the Rockies lost 7-5 to the Phillies on Sunday, Cook looked much like the pitcher who made the All-Star Game last summer. "He seemed to be more aggressive," manager Clint Hurdle said. "He made pitches; he battled on a cold and challenging day to be out there. He had nine groundballs that he rolled for 11 outs." Cook's pitching line - three runs and seven hits over six innings - wasn't great, but it should have been enough for a victory. Cook's best friend, as always, was his double-play sinker. He escaped jams in the fourth and sixth with inning-ending groundball double plays. No surprise there, since Cook has induced an average of 1.31 double plays per nine innings pitched over the last four seasons - the best rate in the majors. Being able to turn to that pitch is a security blanket. "Most of the time I hope I don't have to use it," Cook said. "Knowing that I do have it is good. I've worked really hard when I get in those situations to be able to slow the game down and realize I am just one pitch away from getting out of it.""