Kyle Schwarber, Miguel Montero and Starlin Castro all hit home runs in support of another solid outing from Jake Arrieta, and the Chicago Cubs beat the San Francisco Giants 8-5 Tuesday night for their sixth straight win. Schwarber's towering, three-run homer in the third set the tone for the Cubs, who have won 21 of 25 games to pull 7 1/2 games ahead of the Giants for the second wild-card spot. Arrieta (16-6) had his 13th consecutive quality start, the longest streak by a Cubs pitcher in 23 years.