Keller is coming off a breakout year working out of the Cubs bullpen. The 30-year-old righty fired 69 2/3 innings of 2.07 ERA ball. Keller recorded 25 holds and a trio of saves while relinquishing just three leads all year. He was fantastic in the second half, allowing one run while striking out 35 hitters across 27 2/3 frames. He picked up two more saves and a hold while tossing 5 2/3 innings of one-run ball in the playoffs.