The New York Yankees' acquisition of Brandon McCarthy upgrades a beleaguered rotation that's not getting any help from the farm system, while the Arizona Diamondbacks don't capitalize on one of their most valuable trade assets and get nothing in return but some financial savings.
McCarthy turned out to be a poor fit for Arizona's hitter-friendly ballpark and almost as hitter-friendly defense, but he fared well in the three things a pitcher can do to help himself most: miss bats, avoid walks and keep the ball on the ground. While some things out of McCarthy's control have gone against him, he's also had trouble keeping his sinker -- his best pitch -- from drifting up in the zone. He has given up 15 homers -- that's one out of every five fly balls he's allowed -- and all but two came on sinkers or cutters, pitches designed to generate ground balls or at least weaker contact. All 13 homers off sinkers or cutters were pitches left at or above the midpoint of the strike zone.
Although Yankee Stadium isn't a pitcher's paradise, McCarthy has never been this homer-prone before, and there almost has to be some element of misfortune in there, even if there has been a true drop in his ability to avoid home runs. That's a long way of saying I think McCarthy will be better for the Yanks than he was in Arizona and will likely post an ERA around 4, rather than 5.