Astros:

Jordan Schafer CF
Jose Altuve 2B
Jed Lowrie SS
Carlos Lee 1B
Scott Moore 3B
J.D. Martinez LF
Brian Bogusevic RF
Chris Snyder C
Lucas Harrell P

Harrell pitched a complete game against the Padres in his last start, but he's a minor-league veteran who has a long history of poor strikeout rates, so I would hope the Pirates could get to him.

Pirates:

Alex Presley LF
Neil Walker 2B
Andrew McCutchen CF
Garrett Jones RF
Casey McGehee 1B
Pedro Alvarez 3B
Rod Barajas C
Clint Barmes SS
A.J. Burnett P

This is the Pirates' new-look lineup now that Jose Tabata is gone. Walker moves up to second in the order. Burnett's name is actually spelled "Burnette" on the lineup card, which is a mistake, unless the Pirates have promoted State College Spike Jake Burnette all the way to the majors.

UPDATE 5:20: Pedro Alvarez has been pulled from tonight's lineup. Here it is after the change:

Alex Presley LF
Drew Sutton RF
Andrew McCutchen CF
Garrett Jones 1B
Neil Walker 2B
Casey McGehee 3B
Rod Barajas C
Clint Barmes SS
A.J. Burnett P