CHICAGO — Kris Bryant and Miguel Montero had consecutive RBI doubles in the sixth as the Chicago Cubs extended Shelby Miller’s winless skid to 17 games with a 5-3 victory over the Atlanta Braves on Friday. Anthony Rizzo added an RBI single in the seventh for Chicago. Jason Motte (8-1) earned the win in relief, starting a string of four innings during which Cubs relievers didn’t allow a hit until pinch-hitter Nick Swisher doubled with one out in the ninth off of closer Hector Rondon.