I just remember reading somewhere awhile ago that the Rockies actively look for sinkerball pitchers to fit their environment. Guessing because there isn't as much movement on it compared to a curve or even a slider/2 seamer. That said, a sinker that doesn't sink as much especially for a pitcher who isn't acclimated to pitching at Coors will lead to weak contact ground balls being turned into hard hit fly balls so who knows. http://www.baseballprospectus.com/article.php?articleid=20069 Curveball = really bad Slider and cutter = not as bad as the rest Everything else = equally horrible, but not so much as a curve Really, nothing works. It is a miserable, horrible place for pitchers. I think this quote best illustrates things. The Rockies have played there for decades now. And they've spent decades trying to formulate the secret sauce to pitching in Coors. And they never can figure it out. So they keep changing the sauce. Nothing will ever work. There is no answer. There is no sauce. That place is where pitching goes to die. And you should never feel safe with any pitcher going to pitch in that park. It sucks, Denver is a fine MLB market, but I think they will always having trouble building a consistent winner because of this issue. There is nothing you can do to fix it. There are no areas in Denver you can build a ballpark in low elevation, building a dome would only slightly lessen the effects of the altitude.