Ashby (9-0) picked up the win after giving up a hit and a walk with two strikeouts over two scoreless innings against the Cardinals on Wednesday.
Ashby entered the game in the top of the seventh, preventing Milwaukee's 1-0 deficit from expanding while striking out two batters. The 28-year-old went on to pitch another scoreless frame in the eighth before the Brewers tacked on two runs to put him in line for the victory. The left-hander leads the major leagues in wins this season and also leads Brewers relievers in strikeouts (49).