Chicago, IL -- (Sports Network) - Alfonso Soriano hit a pair of home runs and drove in four, as Chicago bested Pittsburgh, 7-4, in the opener of a three- game weekend set from Wrigley Field. Geovany Soto and Mark DeRosa also went deep for the Cubs, winners in seven of their last eight games. Sean Gallagher (1-0) earned his first major-league win for Chicago, scattering four hits and one run over six innings. The 22-year-old walked three and struck out three, needing 91 pitches to complete the outing. Doug Mientkiewicz and Jason Bay homered for the Pirates, who have dropped two of three overall. Nate McLouth doubled and scored while Xavier Nady also drove in a run. Pittsburgh starter Tom Gorzelanny (3-4) took the loss, charged with seven hits and seven runs over six innings, giving up four home runs.