Cubs upgrade bullpen with Ryan Zeferjahn, give up Moises Ballesteros in trade with Angels

A day after addressing the top of their starting rotation and making a trade-deadline splash by landing veteran righty Kevin Gausman, the Cubs upgraded their relief corps, bringing in 28-year-old right-hander Ryan Zeferjahn in a deal with the Angels. It cost them one of their top young players, with slugger Moises Ballesteros going the other way in the trade. Zeferjahn has been very effective this season, already logging 51⅔ relief innings and posting a 3.66 ERA. He’s been even better over the…