Jeremy Guthrie confirmed that his early-season struggles are not injury related. "I'm healthy,'' Guthrie said. ''I'm just not executing pitches as well as I need to. My biggest problem is that I am not throwing strikes early, and when I get behind in counts I'm throwing [bad] pitches." Guthrie allowed seven runs in his last start to the Diamondbacks and currently owns a 6.35 ERA and 1.73 WHIP through his first nine games. The 12 home runs he's given up are tied for second-most in the National League.