Lerner also announced that assistant general manager Mike DeBartolo has been named as Rizzo's replacement on an interim basis. DeBartolo will immediately be tasked with running the draft room for next week's MLB Draft, in which the Nationals have the top pick.

The team announced Sunday that it has fired manager Dave Martinez and general manager Mike Rizzo. Washington is 37-53 on the season, sitting in fifth place in the NL East. ESPN's Jeff Passan first reported the firings.

Headed into an off day and stuck in last place in the NL East, the Washington Nationals fired manager Dave Martinez and general manager Mike Rizzo on Sunday night, hours after a 6-4 loss at home completed a sweep by the Boston Red Sox.