In 2017, the Yankees enjoyed the benefit of a really deep relief corps. Coming into the season, the tent poles of that bullpen were expected to be Dellin Betances and Aroldis Chapman. While both experienced periods of substandard play, their final numbers on the season both ended up being decent.
That bullpen got even deeper when a July trade with the White Sox brought David Robertson and Tommy Kahnle into the fold. Robertson was nearly flawless in the regular season, while Kahnle struck out 36 batters in just 26.