The Brewers began the day barely in the playoff race, a year they reached the NL championship series. Any Milwaukee loss or St. Louis win would mean elimination.
Hart drove in four runs to back Estrada (5-7), who won for the third time in four starts. The right-hander allowed only four singles and a walk after giving up six earned runs in just four innings against Washington in his last outing.
Houston hit three home runs in the ninth to score five times off reliever Livan Hernandez. Fernando Martinez and Brian Bogusevic hit two-run homers and Tyler Greene added a solo shot.
