With one out in the fifth inning, Brandon Crawford on first base and Colorado clinging to a 1-0 lead, Colvin hit a liner that landed down the left-field line and appeared to raise a puff of chalk -- which would have meant the ball was fair. Miller, however, signaled foul.
Video reviews of the play provided sufficient evidence to overturn the call. Colvin was awarded second base while Crawford was moved to third.
The turn of events paid off for the Giants, who proceeded to score three runs as Gregor Blanco lashed a two-out, two-run triple and came home on Colorado shortstop Troy Tulowitzki's fielding error.
Bochy challenged another call in the sixth, claiming that Colorado's Drew Stubbs pulled into second base after a throw arrived from Madison Bumgarner, who was trying to record a forceout on DJ LeMahieu's bunt. This time, the call stood.
On the second replay, the one the Giants "lost," Bochy said, "You look at the big board and it looks like his [Crawford's] foot was on the base."
Bochy has successfully challenged seven calls in 11 attempts this season.
Chris Haft is a reporter for MLB.com. Read his blog, Haft-Baked Ideas, and follow him on Twitter at @sfgiantsbeat. This story was not subject to the approval of Major League Baseball or its clubs.