Paul DeJong hit an opposite-field solo homer to lead off the home eighth and Yadier Molina followed with a double to drive in Jose Martinez as the Cardinals scored twice and then held on for a 4-3 victory over the visiting Milwaukee Brewers before a crowd of 38.474 Tuesday night at Busch Stadium.
The Brewers had pulled even at 2-2 when Shaw hit a solo homer against reliever John Gant with two outs in the sixth.
The Cardinals had taking the lead at 2-1 with two outs in the fifth. After Matt Carpenter walked and then stole his first base of the season, Paul Goldschmidt delivered a hit to left-center to put the home team back on top.