In 1956 Unitas joined the Baltimore Colts NFL team under legendary coach Weeb Ewbank. The Colts won the NFL championship under his leadership in 1958, by defeating the New York Giants in sudden death overtime. It was the first overtime game in NFL history, and is often referred to as the "greatest game ever played". The game, nationally televised by NBC, has been credited for sparking the rise in popularity of professional football during the 1960s. Unitas then led the Colts to a repeat championship in 1959.