 On July 23, 1962, Major League Baseball had its first satellite telecast (via Telstar Communications).The telecast included portion of a contest between the Chicago Cubs vs. the Philadelphia Phillies from Wrigley Field with Jack Brickhouse commentating on WGN-TV.By 1969, the usage of chroma key (in which the commentators would open a telecast by standing in front of a greenscreen composite of the stadiums' crowds) became a common practice for baseball telecasts.