Turn of the century baseball attendances were modest by later standards. The average for the 1,110 games in the 1901 season was 3,247.  However the first 20 years of the 20th century saw an unprecedented rise in the popularity of baseball. Large stadiums dedicated to the game were built for many of the larger clubs or existing grounds enlarged, including Shibe Park , home of the Philadelphia Athletics , Ebbets Field in Brooklyn , the Polo Grounds in Manhattan , Boston 's Fenway Park along with Wrigley Field and Comiskey Park in Chicago . Likewise from the Eastern League to the small developing leagues in the West, and the rising Negro Leagues professional baseball was being played all across the country. Average major league attendances reached a pre World War I peak of 5,836 in 1909, before falling back during the war. Where there weren't professional teams, there were semi-pro teams, traveling teams barnstorming , company clubs and amateur men's leagues. In the days before television, if you wanted to see a game, you had to go to the game.
Which made Canseco’s second benefactor — Mike Wallace — all the more important. John Hamlin, a producer at 60 Minutes , had gotten a tip about Canseco’s book from a friend at another network. (The friend couldn’t act on it because his employer was a Major League Baseball rights holder.) Hamlin began calling baseball people and confirming the details. Almost no one would talk on the record, but they suggested that Canseco’s account was true. One of the few allegations Hamlin couldn’t verify was Canseco’s insistence that Roger Clemens was juicing.