As the 2019 season draws near and rosters take a clearer scope, MLB.com has been examining each club's current construction and projecting how personnels might look on Opening Day.
With bullpens becoming more versatile and less defined, the closer role has seen as drastic a change as any in recent years -- particularly with many clubs opting for their best relief arms in the most high-leverage situations, regardless of inning.
That trend could certainly continue in 2019, and it has led to some uncertainty about who will pitch the ninth for a handful of clubs. And for others, some of the most established closers will retain their roles.