Houston Astros (33-27, first in the AL West) vs. Pittsburgh Pirates (22-39, fifth in the NL Central) Pittsburgh; Wednesday, 6:40 p.m. EDT PITCHING PROBABLES: Astros: Ryan Gusto (3-2, 4.62 ERA, 1.56 WHIP, 42 strikeouts); Pirates: Mike Burrows (0-1, 8.