Let me preface this by saying overall, the Chicago Cubs bullpen has been very good this season. After a rough stretch early on, guys fell into their designated roles and have been very reliable. Outside of making the switch away from Hector Rondon as the closer when he was having some confidence issues, Joe Maddon has been able to rely on them.
Chicago Cubs
Until recently that is.
Once the Cubs started having some bullpen issue earlier in the season, they looked to address them rather quickly.