 CBS first covered Major League Baseball in the early days of radio, sharing World Series coverage with NBC beginning in 1927 and All-Star Game coverage beginning in 1933.Mutual joined them in ; the three networks continued to share coverage of baseball's "jewel" events through , with Mutual gaining exclusive rights to the World Series in and the All-Star Game in .NBC, in turn, would have exclusivity for both events from 1957 through 1975.