Josh Collmenter outpitched Madison Bumgarner in a preview of their opening-night matchup, and the Arizona Diamondbacks beat the San Francisco Giants 10-0 Tuesday. Bumgarner, the reigning World Series MVP, and Collmenter are the scheduled starters when the Giants visit Arizona on April 6 to begin the regular season. We were at game speed,'' Bumgarner said. Diamondbacks manager Chip Hale said he gave Collmenter the option of pitching in a minor league game Tuesday in order to keep the Giants from getting a preview of his stuff before the season starts.