Jason Bay hit a two-run homer and the Pittsburgh Pirates earned their first road sweep this season with an 8-7 win over the Houston Astros on Wednesday.

Doug Mientkiewicz drove in two runs, starter Ian Snell had an RBI single and Franquelis Osoria (4-3) pitched two innings of scoreless relief as the Pirates finished off their first sweep since taking three from San Francisco at PNC Park from May 6-8.

Damaso Marte shut out the Astros in the ninth for his fifth save in seven chances.

The Pirates have won three straight road games for the first time this season and have their first three-game victory streak since winning six straight from May 6-12.