Neil Walker carried a nine-game road hitting streak into Tuesday's game. He is 18-for-34 with six RBIs in that span.
Pittsburgh will play nine of its next 12 games against National League Central foes, beginning with the three-game set in St. Louis.
Manager Clint Hurdle, always quotable, is old school and not into social media.
"I'm a twit -- I don't tweet," Hurdle said.
Right-hander James McDonald posted career highs in strikeouts (10) and pitches (114) in Monday's win at Atlanta. He allowed seven hits and three runs over 7 2/3 innings.