The Giants spent the final four innings Saturday with their hearts racing and jerseys soaked with sweat, but it was all worth it.Madison Bumgarner did heavy lifting early and the bullpen held on for three tense innings at Wrigley Field, clinching a needed 3-2 win over Jake Arrieta and the Cubs. The Cubs repeatedly put the tying run on base, including in the ninth. But Anthony Rizzo was caught too far off second on a sacrifice bunt and Santiago Casilla held on for the save. Santa Clara Officers May Boycott Working 49ers Games The Giants jumped ahead in one of the best pitching matchups of the year. Angel Pagan doubled in the first and scored on Tommy La Stella's two-out throwing error. Eduardo Nuñez made it 2-0 in the fourth with a single to right that brought Joe Panik in.Bumgarner needed just 55 pitches to get through four, but Javier Baez, the exciting young Cubs infielder, got to him in the fifth. Baez hit a single and stole second, and he alertly scored on Arrieta's infield single. Arrieta tapped a roller to third and Nuñez tried to barehand it. The ball ticked off his hand and Baez never stopped running, sliding safely into home ahead of Brandon Crawford's...