Costas leaves HBO to join MLB Network

SECAUCUS, N.J. - Bob Costas has left HBO and joined the new MLB Network.

The agreement announced Tuesday does not affect Costas' relationship with NBC, where he has worked since 1980. Although NBC doesn't televise major league games, it does report on them on its news program and those of its affiliates.

'No, we don't have a problem,' NBC spokesman Brian Walker said.

Costas hosted the MLB Network's first show on Jan. 1. HBO insisted on cable exclusivity.