Aramis Ramirez and Carlos Pena each homered twice to power the Cubs to a 7-3 win over the Rockies on Monday afternoon at Wrigley Field. Each hit a two-run and a solo shot, with Ramirez finishing 3-for-4. Matt Garza pitched seven-and-a-third innings of three-run ball for his fourth win. The Cubs had lost four-of-five. The Northsiders kick off a four-game series against the reigning World Series champion San Francisco Giants starting this afternoon with the opener of a day-night doubleheader. Doug Davis will be on the bump in the opener and Rodrigo Lopez will toe the rubber in the nightcap.