"You're seeing a guy finding his rhythm and his confidence," Hurdle said of Alvarez. "To do that on a breaking ball from a left-hander, it was a very pretty swing."
NOTES: The series concludes on Thursday as Pittsburgh's Jeff Karstens (1-2, 5.25 ERA) faces Houston's Bud Norris (5-5, 4.90) ... The Astros haven't won on July 4 since beating the Cubs in 2006 ... Pittsburgh reliever Jason Grilli tossed a scoreless eighth inning while making his 300th major league appearance.
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