The Washington Nationals had one of the best bullpens in the league in the second half of 2017, anchored by mid-season acquisitions Brandon Kintzler, Ryan Madson, and Sean Doolittle. Unfortunately, Kintzler is now a free agent and may play elsewhere in 2018.
If Kintzler departs in free agency, the Nats will have a need for another late-inning reliever. Koda Glover is an excellent young reliever with endless potential, but he cannot be relied upon due to his inability to remain healthy.
If the Nats elect to fill their need through free agency, Bryan Shaw could be a great fit.