PITTSBURGH (AP) — Mitch Keller pitched eight scoreless innings and the Pittsburgh Pirates scored twice in the first inning before holding on to beat the Chicago Cubs 2-1. Keller (11-8) allowed four hits and one walk while striking out six in a 94-pitch outing. The All-Star won back-to-back starts for the first time since May 26 and 31. The Cubs lost for the second time in seven games. They entered play Friday holding the second National League wild card and trailing first-place Milwaukee by three games in the NL Central.