MILWAUKEE (AP) -- The Washington Nationals have activated newly acquired reliever David Carpenter after placing right-hander Aaron Barrett on the 15-day disabled list with a strained right bicep.
The Nationals made the moves before Friday's game against the Milwaukee Brewers.
Barrett left Thursday game against Milwaukee in the middle of an at-bat by Hernan Perez in the eighth inning. Barrett took the loss after giving up the go-ahead single to Milwaukee's Scooter Gennett with two outs.
Barrett is 3-2 with a 4.64 ERA in 30 games this season.