ST. LOUIS (AP) — Willson Contreras hit a go-ahead home run in a four-run sixth inning and the St. Louis Cardinals beat the Pittsburgh Pirates 6-3 on Monday night for their third straight victory. Contreras’ fifth home run came off Pirates reliever Chase Shugart, who walked Nolan Arenado after coming in with the bases empty, one out and a 3-2 lead. Jose Barrero, who hit his first homer as a Cardinal earlier, added a bases-loaded ground-rule double off Shugart for a 6-3 lead. Cardinals starter Miles Mikolas allowed three runs on four hits in five innings. Gordon Graceffo (2-0) pitched the sixth for the win. Ryan Helsley notched his sixth save.