The Washington Nationals placed right-hander Ryan Madson on the 10-day disabled list and named Koda Glover the team's closer.
Madson surrendered David Bote's game-ending grand slam in Sunday night's 4-3 loss to the Chicago Cubs.
The Nationals said Monday that Madson, 37, was dealing with back issues, but the plan was for him to pitch through it. He is 2-5 with a 5.19 ERA and four saves in 48 games this season.
Glover, who missed most of the last two seasons with shoulder and other assorted injuries, was promoted from Triple-A Syracuse on Wednesday, gave up a game-ending solo homer in the ninth inning of a 7-6 loss to the St.