The Washington Nationals have been let down by a shaky bullpen far more times than fans are comfortable remembering. If they want to flip the script and leave those concerns behind, the player who needs to step up the most is Trevor Rosenthal.
Currently, the Nationals late innings will likely contain a combination of All-Star Sean Doolittle, as well as new additions Rosenthal and Kyle Barraclough. But the former Cardinal has the most to prove coming off of Tommy John surgery in 2019.
We all know we can expect elite-level performance from Doolittle in the ninth inning, assuming he has put the foot issue behind him.