A momentary lack of focus turned out to be just enough to wipe out Matt Cain's best outing of the year and keep the former Giants ace winless in three starts.San Francisco Giants starting pitcher Matt Cain throws to the Colorado Rockies during the first inning of a baseball game on Saturday, April 12, 2014, in San Francisco.Colorado Rockies' Troy Tulowitzki (2), Carlos Gonzalez, center, and Brandon Barnes (1) celebrate a 1-0 win over the San Francisco Giants in a baseball game on Saturday, April 12, 2014, in San Francisco.Colorado Rockies' Charlie Blackmon (19) steals third base next to San Francisco Giants third baseman Pablo Sandoval during the third inning of a baseball game on Saturday, April 12, 2014, in San Francisco.Colorado Rockies' Charlie Blackmon (19) scores past San Francisco Giants catcher Hector Sanchez, right, on a sacrifice fly hit by Troy Tulowitzki during the third inning of a baseball game on Saturday, April 12, 2014, in San Francisco.