Former Cub Angel Pagan hit a tiebreaking RBI single in the ninth inning and the NL West-leading San Francisco Giants closed out a successful road trip with a 7-5 win over the Northsiders on Sunday.Santiago Casilla (6-5) pitched an inning to get the victory and Javier Lopez got the final two outs for his sixth save in eight chances, making the Giants 5-1 on a six-game swing against the Astros and Cubs — the two worst teams in the NL Central,or for that matter all of Baseball. San Francisco carried a 3-1 lead into the fifth but Darwin Barney scored on right fielder Hunter Pence’s error and Alfonso Soriano hit a three-run drive off Matt Cain for his 25th homer, putting the Cubs ahead 5-3.Brandon Belt tripled in another ex Cubs Xavier Nady in the sixth and scored the tying run on Manuel Corpas’ wild pitch. Then the Giants took advantage of a bout of wildness by Carlos Marmol to grab the lead in the ninth.Nady led off with a four-pitch walk and was replaced by Gregor Blanco, who swiped second with one down. Brandon Crawford then walked and Pagan followed with a single to center. Marco Scutaro added another RBI single to give the Giants a two-run cushion.Marmol (2-3) was 1-0 with a 1.08 ERA in his previous 17 appearances.The Cubs open a four game series at Washington Monday,but they will miss Steven Strasburg who won on Sunday,and according to the Nationals,will have just two more starts before being shutdown for the season.