Aroldis Chapman
Before the season, in an effort to shore up their lineup, free agents Ben Zobrist, Jason Heyward and John Lackey were signed. To make room for the Zobrist signing, Starlin Castro was traded to the Yankees for Adam Warren and Brendan Ryan, the latter of whom was released a week later. Also during the middle of the season, the Cubs traded their top prospect Gleyber Torres for Aroldis Chapman.