The Florida Marlins are expected to name 80-year old Jack McKeon interim manager, multiple league sources told ESPN The Magazine's Buster Olney late Sunday night.

Edwin Rodriguez unexpectedly resigned Sunday with his team in the midst of a 1-18 June, frustrated with his last-place club after less than one year on the job.

Rodriguez was in his first full season as the Marlins' manager. The Marlins would not have made a change if Rodriguez had not resigned, a team source told ESPN.com's Jayson Stark.

"It's been extremely frustrating for everyone," Florida president of baseball operations Larry Beinfest said. "I think everyone here knows what is going on -- the way we've played, the way we've performed. It's tough on everyone, especially (Rodriguez).

"He communicated with me early this morning that this was something he was thinking about, and when I got to the ballpark we accepted his resignation."