ST. LOUIS (AP) – Starlin Castro hit one of Chicago’s three solo homers and Felix Doubront pitched seven strong innings in his National League debut, sending the Cubs to a 5-1 victory over the slumping St. Louis Cardinals in the opener of a day-night doubleheader Saturday.

Logan Watkins and Chris Valaika also connected for Chicago in the makeup of a May 14 rainout. The last-place Cubs hit four home runs Friday, giving them seven in two games against the Cardinals.

St. Louis has lost four in a row for the second time this season. The Cardinals began the day one game ahead of Atlanta and 1 1/2 up on Pittsburgh for the second NL wild card.

The Cubs have won nine of 13.