The St. Louis Cardinals have fired manager Mike Matheny, the team announced in a statement on Saturday.
"These decisions are never easy, but we felt that a change in leadership was necessary as the team prepares to enter the second half of the season," St. Louis President of Baseball Operations John Mozeliak wrote in the statement.
The Cardinals also fired hitting coach John Mabry and assistant hitting coach Bill Mueller.
Matheny was hired by the Cardinals in November 2011, and he compiled a 591-473 win-loss record during his six-and-a-half years with the team. They went to the playoffs four times in his tenure and won the National League pennant in 2013.