HOUSTON, TX -- Lucas Harrell pitched his first complete game and left fielder J.D. Martinez threw out a runner at the plate in the ninth inning to preserve the Houston Astros' 1-0 victory over the San Diego Padres on Wednesday night.

Matt Downs homered and Harrell finished a six-hitter by striking out Nick Hundley with the bases loaded.

The drive by Downs was one of only two hits by the Astros, who couldn't get anything else going against starter Clayton Richard (5-8).

Harrell (7-6) allowed four hits through the first eight innings, but things got dicey for the rookie after that.