CUBS 4, PIRATES 1CHICAGO — Alfonso Soriano hit two-run homers in consecutive innings to lead the Chicago Cubs to a victory over the Pittsburgh Pirates 4-1 on Saturday.Edwin Jackson and three relievers combined on a five-hitter, and the Cubs handed the Pirates their third loss in 14 games. Pittsburgh came in with baseball’s best record and a seven-game, road-winning streak.Soriano hit a drive off Charlie Morton in the fourth and a shot into the bleachers in left to make it 4-1 in the fifth.That was enough for Jackson (5-10), who won his second straight start. He held the Pirates to one run and four hits in 5 2-3 innings.Matt Guerrier worked two scoreless innings, and Kevin Gregg came on in the ninth for his 15th save in 16 chances.Morton (1-2) pitched six innings for Pittsburgh, allowing four runs and seven hits.