Bob Geren, manager of the Oakland Athletics since the 2007 season, has been "relieved of his duties" by General Manager Billy Beane.
The A's are 27-36 this year, and are in the middle of a nine-game losing streak.
Bob Melvin has been named interim manager and will begin his tenure tonight, as he flies to Chicago to take on the White Sox.
Melvin -- a Palo Alto, Calif., native -- has managed the Arizona Diamondbacks and the Seattle Mariners.
