The super station WGN-TV televises a major league baseball game for the first time. With Jack Brickhouse doing the play-by-play, the White Sox beat the Cubs, 4 – 1, in the first game of the Windy City Classic played at Wrigley Field.

On April 16, 1948 — The super station WGN-TV televises a major league baseball game for the first time. With Jack Brickhouse doing the play-by-play, the White Sox beat the Cubs, 4 – 1, in the first game of the Windy City Classic played at Wrigley Field.

Source
Baseball Reference April 16