The Cardinals, on their worst stretch this season, had lost eight of 10 going into the series finale, and their division lead over Pittsburgh was down to 2 1/2 games. St. Louis then fell behind 2-0 on Todd Frazier’s second-inning homer and Tucker Barnhart’s fourth-inning sacrifice fly.
Those were the only runs the Reds would score against Michael Wacha (16-5), who allowed three hits and four walks in six innings.
Outscored 20-3 in the first three games, the Cardinals tied the score in the fifth against Raisel Iglesias on Kolten Wong’s run-scoring infield single and Matt Carpenter’s RBI single.
Sam LeCure (0-1) walked Greg Garcia and Pham homered on a 2-2 pitch for a 4-2 lead, his second home run of the season and first since July 5.