Juan Cruz (2-6) took the loss.
Bay hit a grand slam in the second, a two-run shot in the fourth and a two-run double in the fifth.
Bay's eight RBIs were the most by a Pirates player since Hall of Famer Ralph Kiner drove in eight against Brooklyn on June 25, 1950. Johnny Rizzo set the club record of nine RBIs against St. Louis on May 30, 1939.
Dave Veres (2-1) got three outs for the victory in the opener. Joe Borowski pitched the ninth for his 31st save in 35 chances.
Nelson Figueroa (2-1) took the loss.
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