The D-backs' bullpen experienced a huge turnaround in 2017, and the club is hoping for similar results with most of last year's cast of characters returning.
D-backs relievers compiled a 3.78 ERA in 2017, good for fifth in the Majors, after ranking 27th with a 4.94 ERA in '16.
One of the reasons for the bullpen's struggles in 2016 was the inability of Arizona's rotation to pitch deep into games. That forced the bullpen to throw 567 innings that year as opposed to just 499 2/3 in '17.
MLB.com is taking a look at the projected bullpen of all 30 teams ahead of Spring Training.