Davis immediately signaled for Pirates manager Clint Hurdle to come out and challenge the call, which he did.
After a review of two minutes and 57 seconds, it was ruled that Barrett's call would stand, as the replay was inconclusive.
Allen Craig followed with a two-out single that scored from Matt Holliday from third base, and Jhonny Peralta later belted his second homer of the game, a three-run shot, to give the Cardinals a 6-0 lead.
Tom Singer is a reporter for MLB.com and writes an MLBlog Change for a Nickel. He can also be found on Twitter @Tom_Singer. This story was not subject to the approval of Major League Baseball or its clubs.