MLB: Chicago Cubs 2, San Francisco 1

July 28, 2013 at 7:22 PM

SAN FRANCISCO, July 28 (UPI) -- Welington Castillo launched a go-ahead homer in the seventh inning Sunday and the Chicago Cubs completed a three-game sweep of San Francisco with a 2-1 win.

The score was tied 1-1 with two out in the seventh when Castillo rocketed a 3-1 pitch from Giants starter Tim Lincecum deep into the left-field bleachers for his third homer of the year.

Cubs starter Travis Wood also socked a solo homer as Chicago got its first series sweep in San Francisco since September 1993.

Wood (7-7) surrendered just one unearned run on four hits over seven innings, overcoming four walks while striking out seven.

Pedro Strop threw a scoreless eighth and Kevin Gregg wrapped up the victory with his 22nd save.

Lincecum (5-11) struck out 10 but allowed two runs on four hits over seven full frames.

Pablo Sandoval produced the only RBI for San Francisco, which dropped a fourth straight overall.

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