Mad-Bum is turning into just Bum. OK, that is being too hard on Madison Bumgarner. He's not a bum, but he's certainly also not the pitcher he was during his prime with the Giants when he was throwing 94 mph. 
Bumgarner gets the start here at Coors Field, the best hitting park in the majors. The price is right to fade him especially with the Diamondbacks' bullpen in a state of flux with closer Joakim Soria out with a calf injury. Bumgarner went 1-4 with a 6.48 ERA last year, permitting an astonishing 66 baserunners in only 41 2/3 innings. 
The Diamondbacks signed him to a huge contract hoping his fastball would return and his command would improve. So far that hasn't happened. His velocity still is down and he hasn't regained his command. That was evident again in Bumgarner's first start when he gave up six runs on seven hits, including two homers, in four innings against the Padres opening day. That game was at pitcher-friendly Petco Park, too. 
Colorado starter Antonio Senzatela didn't pitch well either in his first start this season. He was tagged for seven on nine hits in just 3 1/3 innings by the Dodgers, who could have the best offense in baseball. I have more confidence in Senzatela bouncing back than Bumgarner. Senzatela turned a corner last season going 5-3 with a 3.44 ERA. 
I like the Rockies' lineup better than the Diamondbacks, especially with Arizona missing injured shortstop Nick Ahmed and outfielder Kole Calhoun.