KDKA and WJZ of Newark broadcast the first World Series on the radio, with Grantland Rice and Tommy Cowan calling the games for KDKA and WJZ, respectively. \
Just like in the movie Bull Durham the broadcasters were not actually at the game but reported based on a telegraph wire.
The New York Giants played the New York Yankees. The Yankees won that first game 3-0. It was played at the Polo Ground, and attendance was 30,203. But the Giants went on to win the series 5 games to 3 (best 5 of 9), and also the first World Series appearance by the Yankees, who I understand make it back a few times.