The Milwaukee Brewers open a four-game series tonight at Wrigley Field against the last-place Chicago Cubs.  The Crew remains embroiled in a close four-team race in the National League Central.  Milwaukee is two games ahead of second-place Saint Louis, two-and-a-half up on Pittsburgh, and five ahead of Cincinnati.  The Cubs are the only Central team that’s of any real distance back, at 14 off the pace with a 50-66 overall record.  The Cubs will put up right-hander Jake Arrieta at 6-3 tonight against Brewers’ right-hander Yovani Gallardo who is 6-6 for the season.