DENVER (AP) -- Tyler Chatwood pitched six strong innings, Nolan Arenado hit a go-ahead single and the Colorado Rockies beat the Chicago Cubs 4-3 on Sunday to win the three-game series. Chatwood (6-3), who went the distance last time out but was a tough-luck loser to Zack Greinke and the Los Angeles Dodgers 1-0, allowed seven hits and two runs, one earned. Starlin Castro had four hits for Chicago, matching a career high, and Anthony Rizzo homered. Edwin Jackson (6-11) settled down after a rough start to go seven innings, allowing five hits and four runs -- three earned. All the damage off him came with two outs.