In the early 20th century, two pitchers named Joe Oeschger adn Leon Cadore pitched in a 26-inning game between the Dodgers and Braves. They both went all the way.
I remember reading an article about Walter Johnson, a Hall of Fame pitcher from that era. He was considered the hardest-throwing pitcher of his time, and legend had him compared to more modern counterparts like Nolan Ryan and Randy Johnson. This article was a combination of a historical retrospect and a scientific analysis of Johnson's windup on grainy videotapes, and the experts who conducted the study figured out that he probably threw a baseball around 80-85 miles per hour.