Finnegan (4-4) was tagged with the loss during the second game of Thursday's doubleheader against the Mets after allowing one run on one hit across one-third of an inning.
Finnegan had the task of sending the game to extra innings after the Nationals rallied to score three runs in the top of the seventh, but he allowed a walkoff homer to Pete Alonso with one out. This ended Finnegan's run of 10 straight appearances without allowing an earned run, though his role as the team's closer shouldn't be in jeopardy going forward.