Zack Greinke is finally pitching like the franchise player the Diamondbacks were expecting. He is 7-0 with a 2.70 ERA at home. Rockies starter Tyler Chatwood is one of the most underrated pitchers in baseball. He has a 2.46 ERA in 146 innings pitched in his past 24 road starts. Look for this pitcher’s duel Saturday to yield a score going Under the posted total.